Typo fix

Suggested by [mnestis](https://www.transifex.com/accounts/profile/mnestis/)
Typo fix

Suggested by [mnestis](https://www.transifex.com/accounts/profile/mnestis/)
Typo fix

Suggested by [mnestis](https://www.transifex.com/accounts/profile/mnestis/)
Typo fix
Merge pull request #1913 from owncloud/typo-fix

Typo fix