diff --git a/gulpfile.ts b/gulpfile.ts
index 3b7a12640..21870473e 100644
--- a/gulpfile.ts
+++ b/gulpfile.ts
@@ -20,16 +20,8 @@ import * as mocha from 'gulp-mocha';
 import * as replace from 'gulp-replace';
 import * as htmlmin from 'gulp-htmlmin';
 const uglifyes = require('uglify-es');
-import * as fontawesome from '@fortawesome/fontawesome';
-import * as regular from '@fortawesome/fontawesome-free-regular';
-import * as solid from '@fortawesome/fontawesome-free-solid';
-import * as brands from '@fortawesome/fontawesome-free-brands';
-
-// Add icons
-fontawesome.library.add(regular);
-fontawesome.library.add(solid);
-fontawesome.library.add(brands);
 
+import { fa } from './src/common/build/fa';
 import version from './src/version';
 import config from './src/conf';
 
@@ -179,7 +171,7 @@ gulp.task('build:client:pug', [
 			.pipe(pug({
 				locals: {
 					themeColor: constants.themeColor,
-					facss: fontawesome.dom.css(),
+					facss: fa.dom.css(),
 					//hljscss: fs.readFileSync('./node_modules/highlight.js/styles/default.css', 'utf8')
 					hljscss: fs.readFileSync('./src/web/assets/code-highlight.css', 'utf8')
 				}
diff --git a/src/common/build/fa.ts b/src/common/build/fa.ts
new file mode 100644
index 000000000..0c21be950
--- /dev/null
+++ b/src/common/build/fa.ts
@@ -0,0 +1,57 @@
+/**
+ * Replace fontawesome symbols
+ */
+
+import * as fontawesome from '@fortawesome/fontawesome';
+import * as regular from '@fortawesome/fontawesome-free-regular';
+import * as solid from '@fortawesome/fontawesome-free-solid';
+import * as brands from '@fortawesome/fontawesome-free-brands';
+
+// Add icons
+fontawesome.library.add(regular);
+fontawesome.library.add(solid);
+fontawesome.library.add(brands);
+
+export const pattern = /%fa:(.+?)%/g;
+
+export const replacement = (_, key) => {
+	const args = key.split(' ');
+	let prefix = 'fas';
+	const classes = [];
+	let transform = '';
+	let name;
+
+	args.forEach(arg => {
+		if (arg == 'R' || arg == 'S' || arg == 'B') {
+			prefix =
+				arg == 'R' ? 'far' :
+				arg == 'S' ? 'fas' :
+				arg == 'B' ? 'fab' :
+				'';
+		} else if (arg[0] == '.') {
+			classes.push('fa-' + arg.substr(1));
+		} else if (arg[0] == '-') {
+			transform = arg.substr(1).split('|').join(' ');
+		} else {
+			name = arg;
+		}
+	});
+
+	const icon = fontawesome.icon({ prefix, iconName: name }, {
+		classes: classes
+	});
+
+	if (icon) {
+		icon.transform = fontawesome.parse.transform(transform);
+		return `<i data-fa class="${name}">${icon.html[0]}</i>`;
+	} else {
+		console.warn(`'${name}' not found in fa`);
+		return '';
+	}
+};
+
+export default (src: string) => {
+	return src.replace(pattern, replacement);
+};
+
+export const fa = fontawesome;
diff --git a/src/common/build/i18n.ts b/src/common/build/i18n.ts
new file mode 100644
index 000000000..1ae22147c
--- /dev/null
+++ b/src/common/build/i18n.ts
@@ -0,0 +1,50 @@
+/**
+ * Replace i18n texts
+ */
+
+import locale from '../../../locales';
+
+export default class Replacer {
+	private lang: string;
+
+	public pattern = /"%i18n:(.+?)%"|'%i18n:(.+?)%'|%i18n:(.+?)%/g;
+
+	constructor(lang: string) {
+		this.lang = lang;
+
+		this.get = this.get.bind(this);
+		this.replacement = this.replacement.bind(this);
+	}
+
+	private get(key: string) {
+		let text = locale[this.lang];
+
+		// Check the key existance
+		const error = key.split('.').some(k => {
+			if (text.hasOwnProperty(k)) {
+				text = text[k];
+				return false;
+			} else {
+				return true;
+			}
+		});
+
+		if (error) {
+			console.warn(`key '${key}' not found in '${this.lang}'`);
+			return key; // Fallback
+		} else {
+			return text;
+		}
+	}
+
+	public replacement(match, a, b, c) {
+		const key = a || b || c;
+		if (match[0] == '"') {
+			return '"' + this.get(key).replace(/"/g, '\\"') + '"';
+		} else if (match[0] == "'") {
+			return '\'' + this.get(key).replace(/'/g, '\\\'') + '\'';
+		} else {
+			return this.get(key);
+		}
+	}
+}
diff --git a/src/web/app/desktop/ui.styl b/src/web/app/desktop/ui.styl
index cb98bf06a..058271876 100644
--- a/src/web/app/desktop/ui.styl
+++ b/src/web/app/desktop/ui.styl
@@ -1,4 +1,4 @@
-@import "../app"
+@import "../../const"
 
 button
 	font-family sans-serif
diff --git a/src/web/const.styl b/src/web/const.styl
new file mode 100644
index 000000000..b6560701d
--- /dev/null
+++ b/src/web/const.styl
@@ -0,0 +1,4 @@
+json('../const.json')
+
+$theme-color = themeColor
+$theme-color-foreground = themeColorForeground
diff --git a/src/web/docs/api.ja.pug b/src/web/docs/api.ja.pug
index 5514a4097..2584b0858 100644
--- a/src/web/docs/api.ja.pug
+++ b/src/web/docs/api.ja.pug
@@ -7,6 +7,7 @@ section
 	h2 自分の所有するアカウントからAPIにアクセスする場合
 	p 「設定 > API」で、APIにアクセスするのに必要なAPIキーを取得してください。
 	p APIにアクセスする際には、リクエストにAPIキーを「i」というパラメータ名で含めます。
+	div.ui.info.warn: p %fa:exclamation-triangle%アカウントを不正利用される可能性があるため、このトークンは第三者に教えないでください(アプリなどにも入力しないでください)。
 	p APIの詳しい使用法は「Misskey APIの利用」セクションをご覧ください。
 
 section
@@ -15,7 +16,7 @@ section
 		| 直接ユーザーのAPIキーをアプリケーションが扱うのは危険なので、
 		| アプリケーションからAPIを利用する際には、アプリケーションとアプリケーションを利用するユーザーが結び付けられた専用のトークン(アクセストークン)をMisskeyに発行してもらい、
 		| そのトークンをリクエストのパラメータに含める必要があります。
-		| (アクセストークンは、ユーザーが自分のアカウントにあなたのアプリケーションがアクセスすることを許可した場合のみ発行されます)
+	div.ui.info: p %fa:info-circle%アクセストークンは、ユーザーが自分のアカウントにあなたのアプリケーションがアクセスすることを許可した場合のみ発行されます
 
 	p それでは、アクセストークンを取得するまでの流れを説明します。
 
@@ -46,9 +47,8 @@ section
 					td 権限
 					td あなたのアプリケーションやWebサービスが要求する権限。ここで要求した機能だけがAPIからアクセスできます。
 
-		p
-			| 登録が済むとアプリケーションのシークレットキーが入手できます。このシークレットキーは後で使用します。
-			| アプリに成りすまされる可能性があるため、極力このシークレットキーは公開しないようにしてください。
+		p 登録が済むとアプリケーションのシークレットキーが入手できます。このシークレットキーは後で使用します。
+		div.ui.info.warn: p %fa:exclamation-triangle%アプリに成りすまされる可能性があるため、極力このシークレットキーは公開しないようにしてください。
 
 	section
 		h3 2.ユーザーに認証させる
@@ -93,7 +93,7 @@ section
 	h2 Misskey APIの利用
 	p APIはすべてリクエストのパラメータ・レスポンスともにJSON形式です。また、すべてのエンドポイントはPOSTメソッドのみ受け付けます。
 	p APIリファレンスもご確認ください。
-	
+
 	section
 		h3 レートリミット
 		p Misskey APIにはレートリミットがあり、短時間のうちに多数のリクエストを送信すると、一定時間APIを利用することができなくなることがあります。
diff --git a/src/web/docs/api/endpoints/view.pug b/src/web/docs/api/endpoints/view.pug
index 90084ab27..d271a5517 100644
--- a/src/web/docs/api/endpoints/view.pug
+++ b/src/web/docs/api/endpoints/view.pug
@@ -17,7 +17,7 @@ block main
 	p#desc= desc[lang] || desc['ja']
 
 	section
-		h2= common.i18n[lang]['docs']['api']['endpoints']['params']
+		h2 %i18n:docs.api.endpoints.params%
 		+propTable(params)
 
 		if paramDefs
@@ -28,5 +28,5 @@ block main
 
 	if res
 		section
-			h2= common.i18n[lang]['docs']['api']['endpoints']['res']
+			h2 %i18n:docs.api.endpoints.res%
 			+propTable(res)
diff --git a/src/web/docs/api/entities/view.pug b/src/web/docs/api/entities/view.pug
index 99e786c69..2156463dc 100644
--- a/src/web/docs/api/entities/view.pug
+++ b/src/web/docs/api/entities/view.pug
@@ -10,7 +10,7 @@ block main
 	p#desc= desc[lang] || desc['ja']
 
 	section
-		h2= common.i18n[lang]['docs']['api']['entities']['properties']
+		h2 %i18n:docs.api.entities.properties%
 		+propTable(props)
 
 		if propDefs
diff --git a/src/web/docs/api/gulpfile.ts b/src/web/docs/api/gulpfile.ts
index 2e8409c59..4c30871a0 100644
--- a/src/web/docs/api/gulpfile.ts
+++ b/src/web/docs/api/gulpfile.ts
@@ -10,13 +10,16 @@ import * as pug from 'pug';
 import * as yaml from 'js-yaml';
 import * as mkdirp from 'mkdirp';
 
+import locales from '../../../../locales';
+import I18nReplacer from '../../../common/build/i18n';
+import fa from '../../../common/build/fa';
 import config from './../../../conf';
 
 import generateVars from '../vars';
 
 const commonVars = generateVars();
 
-const langs = Object.keys(commonVars.i18n);
+const langs = Object.keys(locales);
 
 const kebab = string => string.replace(/([a-z])([A-Z])/g, '$1-$2').replace(/\s+/g, '-').toLowerCase();
 
@@ -124,6 +127,9 @@ gulp.task('doc:api:endpoints', () => {
 						console.error(renderErr);
 						return;
 					}
+					const i18n = new I18nReplacer(lang);
+					html = html.replace(i18n.pattern, i18n.replacement);
+					html = fa(html);
 					const htmlPath = `./built/web/docs/${lang}/api/endpoints/${ep.endpoint}.html`;
 					mkdirp(path.dirname(htmlPath), (mkdirErr) => {
 						if (mkdirErr) {
@@ -164,6 +170,9 @@ gulp.task('doc:api:entities', () => {
 						console.error(renderErr);
 						return;
 					}
+					const i18n = new I18nReplacer(lang);
+					html = html.replace(i18n.pattern, i18n.replacement);
+					html = fa(html);
 					const htmlPath = `./built/web/docs/${lang}/api/entities/${kebab(entity.name)}.html`;
 					mkdirp(path.dirname(htmlPath), (mkdirErr) => {
 						if (mkdirErr) {
diff --git a/src/web/docs/api/mixins.pug b/src/web/docs/api/mixins.pug
index b563a121d..686bf6a2b 100644
--- a/src/web/docs/api/mixins.pug
+++ b/src/web/docs/api/mixins.pug
@@ -1,10 +1,10 @@
 mixin propTable(props)
 	table.props
 		thead: tr
-			th= common.i18n[lang]['docs']['api']['props']['name']
-			th= common.i18n[lang]['docs']['api']['props']['type']
-			th= common.i18n[lang]['docs']['api']['props']['optional']
-			th= common.i18n[lang]['docs']['api']['props']['description']
+			th %i18n:docs.api.props.name%
+			th %i18n:docs.api.props.type%
+			th %i18n:docs.api.props.optional%
+			th %i18n:docs.api.props.description%
 		tbody
 			each prop in props
 				tr
@@ -31,7 +31,7 @@ mixin propTable(props)
 							|  (Date)
 					td.optional
 						if prop.optional
-							= common.i18n[lang]['docs']['api']['props']['yes']
+							| %i18n:docs.api.props.yes%
 						else
-							= common.i18n[lang]['docs']['api']['props']['no']
+							| %i18n:docs.api.props.no%
 					td.desc!= prop.desc[lang] || prop.desc['ja']
diff --git a/src/web/docs/gulpfile.ts b/src/web/docs/gulpfile.ts
index 6668abdec..71033e1bc 100644
--- a/src/web/docs/gulpfile.ts
+++ b/src/web/docs/gulpfile.ts
@@ -7,13 +7,12 @@ import * as path from 'path';
 import * as glob from 'glob';
 import * as gulp from 'gulp';
 import * as pug from 'pug';
-//import * as yaml from 'js-yaml';
 import * as mkdirp from 'mkdirp';
 import stylus = require('gulp-stylus');
 import cssnano = require('gulp-cssnano');
 
-//import config from './../../conf';
-
+import I18nReplacer from '../../common/build/i18n';
+import fa from '../../common/build/fa';
 import generateVars from './vars';
 
 require('./api/gulpfile.ts');
@@ -53,6 +52,9 @@ gulp.task('doc:docs', () => {
 						console.error(renderErr2);
 						return;
 					}
+					const i18n = new I18nReplacer(lang);
+					html = html.replace(i18n.pattern, i18n.replacement);
+					html = fa(html);
 					const htmlPath = `./built/web/docs/${lang}/${name}.html`;
 					mkdirp(path.dirname(htmlPath), (mkdirErr) => {
 						if (mkdirErr) {
diff --git a/src/web/docs/layout.pug b/src/web/docs/layout.pug
index ee8018ec6..9dfd0ab7a 100644
--- a/src/web/docs/layout.pug
+++ b/src/web/docs/layout.pug
@@ -9,6 +9,9 @@ html(lang= lang)
 		link(rel="stylesheet" href="/assets/style.css")
 		block meta
 
+		//- FontAwesome style
+		style #{common.facss}
+
 	body
 		nav
 			ul
@@ -33,6 +36,6 @@ html(lang= lang)
 
 			footer
 				p
-					= common.i18n[lang]['docs']['edit-this-page-on-github']
-					a(href=src target="_blank")= common.i18n[lang]['docs']['edit-this-page-on-github-link']
+					| %i18n:docs.edit-this-page-on-github%
+					a(href=src target="_blank") %i18n:docs.edit-this-page-on-github-link%
 				small= common.copyright
diff --git a/src/web/docs/style.styl b/src/web/docs/style.styl
index 32a2264f1..414be5c53 100644
--- a/src/web/docs/style.styl
+++ b/src/web/docs/style.styl
@@ -1,4 +1,5 @@
 @import "../style"
+@import "./ui"
 
 body
 	margin 0
diff --git a/src/web/docs/ui.styl b/src/web/docs/ui.styl
new file mode 100644
index 000000000..8d5515712
--- /dev/null
+++ b/src/web/docs/ui.styl
@@ -0,0 +1,19 @@
+.ui.info
+	display block
+	margin 1em 0
+	padding 0 1em
+	font-size 90%
+	color rgba(#000, 0.87)
+	background #f8f8f9
+	border-radius 4px
+	overflow hidden
+
+	> p
+		opacity 0.8
+
+		> [data-fa]:first-child
+			margin-right 0.25em
+
+	&.warn
+		color #573a08
+		background #FFFAF3
diff --git a/src/web/docs/vars.ts b/src/web/docs/vars.ts
index da590d7bd..65b224fbf 100644
--- a/src/web/docs/vars.ts
+++ b/src/web/docs/vars.ts
@@ -1,7 +1,8 @@
 import * as fs from 'fs';
 import * as glob from 'glob';
 import * as yaml from 'js-yaml';
-import langs from '../../../locales';
+
+import { fa } from '../../common/build/fa';
 import config from '../../conf';
 const constants = require('../../const.json');
 
@@ -37,9 +38,9 @@ export default function(): { [key: string]: any } {
 
 	vars['config'] = config;
 
-	vars['i18n'] = langs;
-
 	vars['copyright'] = constants.copyright;
 
+	vars['facss'] = fa.dom.css();
+
 	return vars;
 }
diff --git a/src/web/style.styl b/src/web/style.styl
index 573df10d7..c25fc8fb5 100644
--- a/src/web/style.styl
+++ b/src/web/style.styl
@@ -1,9 +1,6 @@
-json('../const.json')
-
 @charset 'utf-8'
 
-$theme-color = themeColor
-$theme-color-foreground = themeColorForeground
+@import "./const"
 
 /*
 	::selection
diff --git a/webpack/module/index.ts b/webpack/module/index.ts
index 15f36557c..088aca723 100644
--- a/webpack/module/index.ts
+++ b/webpack/module/index.ts
@@ -1,5 +1,5 @@
 import rules from './rules';
 
-export default (lang, locale) => ({
-	rules: rules(lang, locale)
+export default lang => ({
+	rules: rules(lang)
 });
diff --git a/webpack/module/rules/fa.ts b/webpack/module/rules/fa.ts
index 47c72a28a..891b78ece 100644
--- a/webpack/module/rules/fa.ts
+++ b/webpack/module/rules/fa.ts
@@ -3,16 +3,7 @@
  */
 
 const StringReplacePlugin = require('string-replace-webpack-plugin');
-
-import * as fontawesome from '@fortawesome/fontawesome';
-import * as regular from '@fortawesome/fontawesome-free-regular';
-import * as solid from '@fortawesome/fontawesome-free-solid';
-import * as brands from '@fortawesome/fontawesome-free-brands';
-
-// Add icons
-fontawesome.library.add(regular);
-fontawesome.library.add(solid);
-fontawesome.library.add(brands);
+import { pattern, replacement } from '../../../src/common/build/fa';
 
 export default () => ({
 	enforce: 'pre',
@@ -20,41 +11,7 @@ export default () => ({
 	exclude: /node_modules/,
 	loader: StringReplacePlugin.replace({
 		replacements: [{
-			pattern: /%fa:(.+?)%/g, replacement: (_, key) => {
-				const args = key.split(' ');
-				let prefix = 'fas';
-				const classes = [];
-				let transform = '';
-				let name;
-
-				args.forEach(arg => {
-					if (arg == 'R' || arg == 'S' || arg == 'B') {
-						prefix =
-							arg == 'R' ? 'far' :
-							arg == 'S' ? 'fas' :
-							arg == 'B' ? 'fab' :
-							'';
-					} else if (arg[0] == '.') {
-						classes.push('fa-' + arg.substr(1));
-					} else if (arg[0] == '-') {
-						transform = arg.substr(1).split('|').join(' ');
-					} else {
-						name = arg;
-					}
-				});
-
-				const icon = fontawesome.icon({ prefix, iconName: name }, {
-					classes: classes
-				});
-
-				if (icon) {
-					icon.transform = fontawesome.parse.transform(transform);
-					return `<i data-fa class="${name}">${icon.html[0]}</i>`;
-				} else {
-					console.warn(`'${name}' not found in fa`);
-					return '';
-				}
-			}
+			pattern, replacement
 		}]
 	})
 });
diff --git a/webpack/module/rules/i18n.ts b/webpack/module/rules/i18n.ts
index aa4e58448..7261548be 100644
--- a/webpack/module/rules/i18n.ts
+++ b/webpack/module/rules/i18n.ts
@@ -3,28 +3,10 @@
  */
 
 const StringReplacePlugin = require('string-replace-webpack-plugin');
+import Replacer from '../../../src/common/build/i18n';
 
-export default (lang, locale) => {
-	function get(key: string) {
-		let text = locale;
-
-		// Check the key existance
-		const error = key.split('.').some(k => {
-			if (text.hasOwnProperty(k)) {
-				text = text[k];
-				return false;
-			} else {
-				return true;
-			}
-		});
-
-		if (error) {
-			console.warn(`key '${key}' not found in '${lang}'`);
-			return key; // Fallback
-		} else {
-			return text;
-		}
-	}
+export default lang => {
+	const replacer = new Replacer(lang);
 
 	return {
 		enforce: 'pre',
@@ -32,14 +14,7 @@ export default (lang, locale) => {
 		exclude: /node_modules/,
 		loader: StringReplacePlugin.replace({
 			replacements: [{
-				pattern: /"%i18n:(.+?)%"/g, replacement: (_, key) =>
-					'"' + get(key).replace(/"/g, '\\"') + '"'
-			}, {
-				pattern: /'%i18n:(.+?)%'/g, replacement: (_, key) =>
-					'\'' + get(key).replace(/'/g, '\\\'') + '\''
-			}, {
-				pattern: /%i18n:(.+?)%/g, replacement: (_, key) =>
-					get(key)
+				pattern: replacer.pattern, replacement: replacer.replacement
 			}]
 		})
 	};
diff --git a/webpack/module/rules/index.ts b/webpack/module/rules/index.ts
index b6a0a5e2e..b02bdef72 100644
--- a/webpack/module/rules/index.ts
+++ b/webpack/module/rules/index.ts
@@ -7,8 +7,8 @@ import tag from './tag';
 import stylus from './stylus';
 import typescript from './typescript';
 
-export default (lang, locale) => [
-	i18n(lang, locale),
+export default lang => [
+	i18n(lang),
 	license(),
 	fa(),
 	base64(),
diff --git a/webpack/webpack.config.ts b/webpack/webpack.config.ts
index 124bd975b..d67b8ef77 100644
--- a/webpack/webpack.config.ts
+++ b/webpack/webpack.config.ts
@@ -8,7 +8,7 @@ import plugins from './plugins';
 import langs from '../locales';
 import version from '../src/version';
 
-module.exports = Object.entries(langs).map(([lang, locale]) => {
+module.exports = Object.keys(langs).map(lang => {
 	// Chunk name
 	const name = lang;
 
@@ -32,7 +32,7 @@ module.exports = Object.entries(langs).map(([lang, locale]) => {
 	return {
 		name,
 		entry,
-		module: module_(lang, locale),
+		module: module_(lang),
 		plugins: plugins(version, lang),
 		output,
 		resolve: {