feat: localization (#196)

* Started adding locale translations :)

* Added some more translations

* Working on translating even more pages

* More translations

* Added test default locale retrieval

* replace `intl.formatMessage` with custom `t` hook

* add more translations

* improve title syntax

* add more translations

* translate admin config page

* translated error messages

* add language selecter

* minor fixes

* improve language handling

* add upcoming languages

* add `crowdin.yml`

* run formatter

---------

Co-authored-by: Steve Tautonico <stautonico@gmail.com>

frontend/src/components/header/ActionAvatar.tsx

@@ -3,6 +3,7 @@ import Link from "next/link";
 import { TbDoorExit, TbSettings, TbUser } from "react-icons/tb";
 import useUser from "../../hooks/user.hook";
 import authService from "../../services/auth.service";
+import { FormattedMessage, useIntl } from "react-intl";
 
 const ActionAvatar = () => {
   const { user } = useUser();
@@ -16,7 +17,7 @@ const ActionAvatar = () => {
       </Menu.Target>
       <Menu.Dropdown>
         <Menu.Item component={Link} href="/account" icon={<TbUser size={14} />}>
-          My account
+          <FormattedMessage id="navbar.avatar.account" />
         </Menu.Item>
         {user!.isAdmin && (
           <Menu.Item
@@ -24,7 +25,7 @@ const ActionAvatar = () => {
             href="/admin"
             icon={<TbSettings size={14} />}
           >
-            Administration
+            <FormattedMessage id="navbar.avatar.admin" />
           </Menu.Item>
         )}
 
@@ -34,7 +35,7 @@ const ActionAvatar = () => {
           }}
           icon={<TbDoorExit size={14} />}
         >
-          Sign out
+          <FormattedMessage id="navbar.avatar.signout" />
         </Menu.Item>
       </Menu.Dropdown>
     </Menu>