[sextante]added checking for R installation
[sextante] fixed idle progress bar in execution dialog
[sextante] updated link to sextante chapter in error messages
[sextante] fixed delete duplicated geoms algorithm
fix activateDeactivateLayerRelatedActions (fixes #8005)
translation update:
- update_ts_files.sh: add -f flag ('fast' mode; only update specified languages
  and don't run tsstat.pl)
- tsstat.pl: cut off latin1 & cyrillic suffix and use only one serbian flag
- unify flag image permission
- german translation update
[Plugin Manager] Better cope with broken plugins
Working, needs tested before adding to change label dialog

- Followup to b383c69, keep labeling dialog from calling init() twice from vector props dialog