Update images for HiDPI
Update image resources on help for HiDPI support
Add and update syntax coloring definitions

- add: Apache (v1.1), Markdown (v1.0.2) , Scala (v1.0), XML (v1.1)
- update: PHP (v2.2), Python (v2.0.1)
Add spaces between words on toolbar labels
Fix a localized string on preferences pane
Update credits
Font preference is now applied immediately