re-implemented user update

- only for text fields
- password and theme need to be re-implemented, too

frontend/src/routes/user/User.svelte

@@ -26,12 +26,12 @@
             <td>{user.id}</td>
         </tr>
         <EditableField key='user.name' value={user.name} onUpdate={patch} />
-        <EditableField key='user.login' value={user.login} />
-        <EditableField key='user.email' value={user.email} />
         <tr>
-            <th>{t('user.language')}</th>
-            <td>{user.language}</td>
+            <th>{t('user.login')}</th>
+            <td>{user.login}</td>
         </tr>
+        <EditableField key='user.email' value={user.email} onUpdate={patch} />
+        <EditableField key='user.language' value={user.language} onUpdate={patch} />
         <tr>
             <th>{t('user.theme')}</th>
             <td>{user.theme}</td>