templater: tell hggettext to collect help of template functions

Makefile

@@ -118,6 +118,7 b' i18n/hg.pot: $(PYFILES) $(DOCFILES) i18n'
 	  hgext/*.py hgext/*/__init__.py \
 	  mercurial/fileset.py mercurial/revset.py \
 	  mercurial/templatefilters.py mercurial/templatekw.py \
+	  mercurial/templater.py \
 	  mercurial/filemerge.py \
 	  $(DOCFILES) > i18n/hg.pot.tmp
         # All strings marked for translation in Mercurial contain

mercurial/templater.py

@@ -793,3 +793,6 b' def stylemap(styles, paths=None):'
                     return style, mapfile
 
     raise RuntimeError("No hgweb templates found in %r" % paths)
+
+# tell hggettext to extract docstrings from these functions:
+i18nfunctions = funcs.values()