cleanup languages. closes #11274

apps/user_ldap/l10n/ur.php

apps/user_webdavauth/l10n/de_CH.js

apps/user_webdavauth/l10n/de_CH.json

apps/user_webdavauth/l10n/sk.js

apps/user_webdavauth/l10n/sk.json

apps/user_webdavauth/l10n/sk.php

core/l10n/de_CH.js

core/l10n/de_CH.json

core/l10n/hi_IN.js

core/l10n/hi_IN.json

core/l10n/hi_IN.php

core/l10n/sk.js

core/l10n/sk.json

core/l10n/sk.php

core/l10n/ur.js

core/l10n/ur.json

core/l10n/ur.php

lib/l10n/de_CH.js

lib/l10n/de_CH.json

lib/l10n/hi_IN.js