[MIFOSX-1602] Add release details to about section

This adds an "about" section to the "help" page.

Due to these changes, these will have to be added to the translation files:

label.heading.versioninfo - translation of "Version Info"
label.heading.releasedate - translation of "Release Date"
label.heading.bugfixes - translation of "Bug Fixes"
label.heading.newfeatures - translation of "New Features"

Both the shortcuts and version info are col-md-6, so they will fit on one row.