feat(frontend/api): i18n support

src/components/Layout/LanguagePicker/index.tsx

@@ -0,0 +1,109 @@
+import React, { useState, useRef, useContext } from 'react';
+import Transition from '../../Transition';
+import useClickOutside from '../../../hooks/useClickOutside';
+import {
+  LanguageContext,
+  AvailableLocales,
+} from '../../../context/LanguageContext';
+import { FormattedMessage, defineMessages } from 'react-intl';
+
+const messages = defineMessages({
+  changelanguage: 'Change Language',
+});
+
+type AvailableLanguageObject = Record<
+  string,
+  { code: AvailableLocales; display: string }
+>;
+
+const availableLanguages: AvailableLanguageObject = {
+  en: {
+    code: 'en',
+    display: 'English',
+  },
+  ja: {
+    code: 'ja',
+    display: '日本語',
+  },
+};
+
+const LanguagePicker: React.FC = () => {
+  const dropdownRef = useRef<HTMLDivElement>(null);
+  const { locale, setLocale } = useContext(LanguageContext);
+  const [isDropdownOpen, setDropdownOpen] = useState(false);
+  useClickOutside(dropdownRef, () => setDropdownOpen(false));
+
+  return (
+    <div className="ml-3 relative">
+      <div>
+        <button
+          className="p-1 text-gray-400 rounded-full hover:bg-cool-gray-500 hover:text-white focus:outline-none focus:shadow-outline focus:text-white"
+          aria-label="Language Picker"
+          onClick={() => setDropdownOpen(true)}
+        >
+          <svg
+            className="w-6 h-6"
+            fill="currentColor"
+            viewBox="0 0 20 20"
+            xmlns="http://www.w3.org/2000/svg"
+          >
+            <path
+              fillRule="evenodd"
+              d="M7 2a1 1 0 011 1v1h3a1 1 0 110 2H9.578a18.87 18.87 0 01-1.724 4.78c.29.354.596.696.914 1.026a1 1 0 11-1.44 1.389c-.188-.196-.373-.396-.554-.6a19.098 19.098 0 01-3.107 3.567 1 1 0 01-1.334-1.49 17.087 17.087 0 003.13-3.733 18.992 18.992 0 01-1.487-2.494 1 1 0 111.79-.89c.234.47.489.928.764 1.372.417-.934.752-1.913.997-2.927H3a1 1 0 110-2h3V3a1 1 0 011-1zm6 6a1 1 0 01.894.553l2.991 5.982a.869.869 0 01.02.037l.99 1.98a1 1 0 11-1.79.895L15.383 16h-4.764l-.724 1.447a1 1 0 11-1.788-.894l.99-1.98.019-.038 2.99-5.982A1 1 0 0113 8zm-1.382 6h2.764L13 11.236 11.618 14z"
+              clipRule="evenodd"
+            />
+          </svg>
+        </button>
+      </div>
+      <Transition
+        show={isDropdownOpen}
+        enter="transition ease-out duration-100"
+        enterFrom="transform opacity-0 scale-95"
+        enterTo="transform opacity-100 scale-100"
+        leave="transition ease-in duration-75"
+        leaveFrom="transform opacity-100 scale-100"
+        leaveTo="transform opacity-0 scale-95"
+      >
+        <div
+          className="origin-top-right absolute right-0 mt-2 w-48 rounded-md shadow-lg"
+          ref={dropdownRef}
+        >
+          <div className="py-2 px-2 rounded-md bg-cool-gray-700 shadow-xs">
+            <div>
+              <label
+                htmlFor="language"
+                className="block text-sm leading-5 font-medium text-cool-gray-300 pb-2"
+              >
+                <FormattedMessage {...messages.changelanguage} />
+              </label>
+              <select
+                id="language"
+                className="mt-1 form-select block w-full pl-3 pr-10 py-2 text-base leading-6 text-white bg-cool-gray-700 border-cool-gray-600 focus:outline-none focus:shadow-outline-indigo focus:border-blue-800 sm:text-sm sm:leading-5"
+                onChange={(e) =>
+                  setLocale && setLocale(e.target.value as AvailableLocales)
+                }
+                onBlur={(e) =>
+                  setLocale && setLocale(e.target.value as AvailableLocales)
+                }
+              >
+                {(Object.keys(
+                  availableLanguages
+                ) as (keyof typeof availableLanguages)[]).map((key) => (
+                  <option
+                    key={key}
+                    value={availableLanguages[key].code}
+                    selected={locale === availableLanguages[key].code}
+                  >
+                    {availableLanguages[key].display}
+                  </option>
+                ))}
+              </select>
+            </div>
+          </div>
+        </div>
+      </Transition>
+    </div>
+  );
+};
+
+export default LanguagePicker;

src/components/Layout/index.tsx

@@ -3,6 +3,7 @@ import SearchInput from './SearchInput';
 import UserDropdown from './UserDropdown';
 import Sidebar from './Sidebar';
 import Notifications from './Notifications';
+import LanguagePicker from './LanguagePicker';
 
 const Layout: React.FC = ({ children }) => {
   const [isSidebarOpen, setSidebarOpen] = useState(false);
@@ -35,6 +36,7 @@ const Layout: React.FC = ({ children }) => {
           <div className="flex-1 px-4 flex justify-between">
             <SearchInput />
             <div className="ml-4 flex items-center md:ml-6">
+              <LanguagePicker />
               <Notifications />
               <UserDropdown />
             </div>