Small collection of minor improvements

Summary:
* Search -> Search.. (KDE HIG)
* renameAction in Clip Menu and not only in right click menu from the project bin
* Typos

Test Plan:
Compile and run

For the moment the renameAction still don't appear in the clip menu
Could need some help figuring it out.

Differential Revision: https://phabricator.kde.org/D20971