Add locale arg to all metadata grabber to facilite grabbing locale specific information. Refs #10240

Cherry-pick of commit f620f2f83607bb5c4c576a476646fec6164ca155

Conflicts:
	mythtv/programs/scripts/metadata/Movie/tmdb.py
Remove the hardcoded director string in Description field of ProgramInfo and allow it to be templated instead. VIDEOS ONLY for now.