Fix issues found by ebn

Summary:
http://ebn.kde.org/sanitizer/reports/kde-4.x/applications/dolphin/index.html

I ignored the Prefer 'folder' over 'directory' issue, since it was a false positive.

Test Plan: meinproc5 still work and no visual change.

Reviewers: yurchor

Reviewed By: yurchor

Subscribers: yurchor, kfm-devel, kde-doc-english

Tags: #dolphin, #documentation

Differential Revision: https://phabricator.kde.org/D27547