Merge pull request #452 from virtualtam/master

Updated French translation: headwords section
Win-specific: ScanPopup: Don't use unsupported word retrieving methods for GD own windows
Added colon (:) to Persian translator string (by Noori)
Win-specific: Fix initialization
Add system proxy choose in preferences
Add proxy authentication dialog
Lupdate all translations, update Russian translation
Fix dictionary headwords dialog calling from dictionaries list if filter string is not empty
Fix history saving while system shutdown
Close dictionary headwords dialog before configuration change
BGL: Fix "width" attribute handling (issue #462)
Implement full-text search
Full-text search: Fix crashes at dictionaries rescan
Add full-text search tuning tab to preferences dialog
Full-text search: Fix case of inside cards in DSL
Full-text search: Fix storing of "Match case" checkbox state
Full-text search: A little optimization of memory usage while indexing
Fix compilation under MacOS/Linux
Full-text search: Ignore " or ' at first position while sorting headwords
Dsl: A little improve of unmatched tags diagnostic