[Settings] Find / Replace and line wrapping

- Adding `'useWrapMode` option to ui-ace directive in settings HTML to apply line wrapping
- Adding CSS, additional markup for a commands legend,  and importing the search box code for implementing find and replace UI within the editor
- Added translations for find and replace
Merge pull request #7 from stulees/chore/editor-find-replace

[Settings] Find / Replace and line wrapping