This is intended to make it very, very easy to update the POT and all of the POs when
changes are made to `language_en.h`. Used without an sha-1 hash, untranslated strings
(i.e., the "source" strings) are updated in the POT/PO's.
However if you specify an --sha=HASH (or -c HASH) option, then the script will use git
to examine the `language_en.h` file from that specified commit, determing the strings
that have changed, and mark all of these strings as `fuzzy` in the POs. This will serve
as a flag to translators that the original has changed. In addition, this `fuzzy` flag
will appear in the headers as "(fuzzy) " in the item comments.
If a translator edits the header directly, he should remove the "(fuzzy )" in the
comment. Then when the PO is rebuilt, the fuzzy flag will be removed automatically.
The reverse is also true; if a translator is working with the PO, he or she should
clear the fuzzy flag and the comment will be adjusted accordingly in the generated
header.
