The very name "synthetic.po" caused problems with weblate

.. because it would add every term from circuitpython.pot to it;
then in turn, "make translate" would remove almost every message
from circuitpython.pot, and then give a pre-commit error.

Hopefully "synthetic.pot" won't get the same treatment.

This may require manual intervention on weblate to resolve a merge
conflict and undo weblate's chyange to synthetic.po/.pot.

Author: jepler

Makefile

@@ -226,7 +226,7 @@ pseudoxml:
 .PHONY: all-source
 all-source:
 
-TRANSLATE_COMMAND=find $(TRANSLATE_SOURCES) -type d \( $(TRANSLATE_SOURCES_EXC) \) -prune -o -type f \( -iname "*.c" -o -iname "*.h" \) -print | (LC_ALL=C sort) | xgettext -x locale/synthetic.po -f- -L C -s --add-location=file --keyword=MP_ERROR_TEXT -o - | sed -e '/"POT-Creation-Date: /d'
+TRANSLATE_COMMAND=find $(TRANSLATE_SOURCES) -type d \( $(TRANSLATE_SOURCES_EXC) \) -prune -o -type f \( -iname "*.c" -o -iname "*.h" \) -print | (LC_ALL=C sort) | xgettext -x locale/synthetic.pot -f- -L C -s --add-location=file --keyword=MP_ERROR_TEXT -o - | sed -e '/"POT-Creation-Date: /d'
 locale/circuitpython.pot: all-source
 	$(TRANSLATE_COMMAND) > $@