Bug11151 Fix Language update_po.py to scan for XML fragments in Python files.

[prculley]

The GEPS044 updated uimanager work included a bunch of XML fragments as strings embedded in the Python files. Unfortunately I did not realize that these would not be found by the standard xgettext utility.

I've updated our update_po script to scan for these fragments, searching for translatable strings, and adding them to the gramps.pot.

In the process I discovered a number of cases where I was attempting to translate (via the XML fragments) already translated strings. The second commit corrects that (and updates gramps.pot).

Thanks to our Finnish translator "niememat" who spotted this issue.

[codecov-io]

Codecov Report

Merging #826 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #826   +/-   ##
=======================================
  Coverage   41.96%   41.96%           
=======================================
  Files        1066     1066           
  Lines      144760   144760           
=======================================
  Hits        60751    60751           
  Misses      84009    84009

Impacted Files	Coverage Δ
gramps/plugins/view/citationtreeview.py	0% <ø> (ø)	⬆️
gramps/plugins/view/repoview.py	0% <ø> (ø)	⬆️
gramps/plugins/view/geofamily.py	0% <ø> (ø)	⬆️
gramps/gui/views/tags.py	0% <ø> (ø)	⬆️
gramps/plugins/lib/libpersonview.py	0% <ø> (ø)	⬆️
gramps/plugins/view/eventview.py	0% <ø> (ø)	⬆️
gramps/plugins/view/familyview.py	0% <ø> (ø)	⬆️
gramps/gui/views/navigationview.py	0% <ø> (ø)	⬆️
gramps/gui/displaystate.py	0% <ø> (ø)	⬆️
gramps/gui/plug/quick/_quickreports.py	13.63% <ø> (ø)	⬆️
... and 8 more

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