Clean up according to comments

https://github.com/owncloud/documentation/commit/7d07fa3d58dacf524723f55b508a16c198d8eba1
https://github.com/owncloud/documentation/commit/0a9a5ccdad7174e31e41af0eae7e7a0a060bf5f6
Fix wording
Merge pull request #288 from owncloud/fix-theming

Clean up according to comments