Make language dropdown a more sensible width

src/skins/vector/css/matrix-react-sdk/structures/_UserSettings.scss

@@ -131,6 +131,10 @@ limitations under the License.
     position: absolute;
 }
 
+.mx_UserSettings_language {
+    width: 200px;
+}
+
 .mx_UserSettings_profileTable
 {
     display: table;