Re-localise window title when different language is selected
Added couple of small functions to cut down on code duplication
Make string better localisable

Fixes https://github.com/raspberrypi/noobs/commit/cee4a39969ead55fa012996a5f8a99045475d32b#L3R334
Fix string issue mentioned by @lurch in comment on raspberrypi/noobs@cee4a39969ead55fa012996a5f8a99045475d32b
Merge branch 'patch-1' of https://github.com/lurch/noobs into dev
Closes #46
Update output files and change version string to 1.2beta from 1.1