add a fallback locale for personal settings page

otherwise if the locale is set to an invalid or no longer existing locale
the rendering of the setting page will throw an exception

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/settings/lib/Settings/Personal/PersonalInfo.php

@@ -251,6 +251,13 @@ class PersonalInfo implements ISettings {
 			return 0 === strpos($localeCode['code'], $userLang);
 		});
 
+		if (!$userLocale) {
+			$userLocale = [
+				'code' => 'en',
+				'name' => 'English'
+			];
+		}
+
 		return [
 			'activelocaleLang' => $userLocaleString,
 			'activelocale' => $userLocale,