Move POT_PATH to __init__.py file so it can be shared, and rename to POT_DIRPATH for consistency.
Fix for #1919: auto-insert translator comment for any translation containing a format string.
Implement test to make sure translation strings are properly commented.
Adding test case for pot creation and comment-checking.
Merge pull request #139 from bcipolli/1919

Auto-insert translator comment for any translation containing a format string