Merge pull request #503 from virtualtam/master

Updated French translation
Allow to choose help language
Lupdate all translations, update Russian translation
Update screenshots in reference
Fix article header in "Modern" and "Lingoes-Blue" styles for very long dictionary names
Description for SDictionary dictionaries
Dictionaries dialog: Make dictionary name field in dictionary information selectable
Dictionaries dialog: Show dictionaries number
Lupdate all translations, update Russian translation
Update Korean translation (by Panho Ku)
Fix word search in case of escaped wildcard at first position
Epwing: Create additional headwords separated by charset (issue #504)
Updated French translation: miscellaneous help entries

Signed-off-by: VirtualTam <virtualtam@flibidi.org>