cleanup languages. closes #11274

apps/files/l10n/de_CH.js

apps/files/l10n/de_CH.json

apps/files/l10n/hi_IN.js

apps/files/l10n/hi_IN.json

apps/files/l10n/sk.js

apps/files/l10n/sk.json

apps/files/l10n/ur.js

apps/files/l10n/ur.json

apps/files_encryption/l10n/de_CH.js

apps/files_encryption/l10n/de_CH.json

apps/files_external/l10n/de_CH.js

apps/files_external/l10n/de_CH.json

apps/files_external/l10n/sk.js

apps/files_external/l10n/sk.json

apps/files_external/l10n/sk.php

apps/files_sharing/l10n/de_CH.js

apps/files_sharing/l10n/de_CH.json

apps/files_sharing/l10n/sk.js

apps/files_sharing/l10n/sk.json

apps/files_sharing/l10n/sk.php