Fix #8769 - Missing flags for 3 locales

Fixed the images related to servian translations, ignore the 'en'
translation (overrided for 'en_US') in the load of the QsgOptions
dialog.
[relations] Save relation name from add dialog.
And some smaller leftover cleanup
fix instant crash on windows again (followup dc3b56a1 and 9d8d3178)
use static local instead of pointer/global to make windows and possibly valgrind happy (followup 9e6e62d9c)
Merge pull request #926 from ahuarte47/Issue_8769

Fix #8769 - Missing flags for 3 locales
Lithuanian translatio update
Merge pull request #931 from tomass/master

Lithuanian translatio update
[processing] fixed breaklines in script help
[processing] homogenize widgets used for ParameterNumber (fix 8807)
Create hash method for QgsPoint (Fix #8775)
[spatialite] Several fixes for provider (Fix #8636)
And fixes the NoGeometry behavior
python's expanduser doesn't necessarily returns utf-8 (followup 4cb37b1a)
spit: use qt templates
use static locals instead of global pointers for some ^Cngletons (proably more valgrind happyness; followup 572bda85)
[spatialite] Add proper support for NULL values
[spatialite] Improve field-type handling when changing attributes
Fix graphical corruption during item resize
Remove outdated TODO
[processing] remove unused GDAL icons
[processing] use default icon for fillnodata