i18n: extract doc string of each web commands as translatable one

Before this patch, doc string of each web commands isn't extracted as
translatable one, even though web commands are listed up in "hg help
hgweb".

This patch adds "mercurial/hgweb/webcommands.py" on to arguments of
"i18n/hggettext". "i18nfunctions" added into "webcommands.py" is used
by "i18n/hggettext" to get the list of functions having translatable
doc string.

Makefile

@@ -120,6 +120,7 b' i18n/hg.pot: $(PYFILES) $(DOCFILES) i18n'
 	  mercurial/templatefilters.py mercurial/templatekw.py \
 	  mercurial/templater.py \
 	  mercurial/filemerge.py \
+	  mercurial/hgweb/webcommands.py \
 	  $(DOCFILES) > i18n/hg.pot.tmp
         # All strings marked for translation in Mercurial contain
         # ASCII characters only. But some files contain string

mercurial/hgweb/webcommands.py

@@ -1318,3 +1318,6 b' def help(web, req, tmpl):'
     except error.UnknownCommand:
         raise ErrorResponse(HTTP_NOT_FOUND)
     return tmpl('help', topic=topicname, doc=doc)
+
+# tell hggettext to extract docstrings from these functions:
+i18nfunctions = commands.values()