Bug 750622 patch 1: merge x-baltic with x-western, r=jfkthame
Bug 750622 patch 2: merge x-central-euro with x-western, r=jfkthame
Bug 756022 patch 3: merge tr with x-western, r=jfkthame
Bug 756022 patch 4: change "Western" to "Latin" and "Other Languages" to "Other Writing Systems" in the font preferences dialog, r=jfkthame
Bug 756022 patch 5: delete obsoleted comments in langGroups.properties and assign x-western to a few unassigned languages that use Latin script, r=jfkthame