Merge pull request #506 from virtualtam/master

Updated French translation: miscellaneous help entries
Epwing: Use libeb search engine in addition to GD index search (issue #504)
Epwing: Fix case of several articles per one word while searching via libeb search engine (issue #504)
Epwing: Handle different encodings while search via libeb engine
Epwing: Fix search of some headwords via libeb
Epwing: Fix typo in diagnostic message
Fix play ADPCM wav files via internal player
Mac-specific: Fix help installing for any build directory
Update ko_KR.ts
Merge pull request #513 from panho10/patch-1

Update ko_KR.ts
Handle "audio" tag in Wiki-dictionaries to play sounds via GD player