Makefile: wrap hg.pot strings at 82 chars

By default, xgettext will wrap strings at 79 characters. This width
includes the two double-quotes and the '\n' added. Our strings are now
wrapped at 78 characters and a line can therefore be up to 82
characters wide in the .po file.

Setting the width to 82 characters ensures that xgettext does no silly
wrapping on our already-wrapped strings while still wrapping long
one-liners at 82 characters.

Makefile

@@ -89,7 +89,7 b' i18n/hg.pot: $(PYTHON_FILES)'
         # Extracting with an explicit encoding of ISO-8859-1 will make
         # xgettext "parse" and ignore them.
 	echo $^ | xargs \
-	  xgettext --package-name "Mercurial" \
+	  xgettext --width 82 --package-name "Mercurial" \
 	  --msgid-bugs-address "<[e-mail]>" \
 	  --copyright-holder "Matt Mackall <[e-mail]> and others" \
 	  --from-code ISO-8859-1 --join --sort-by-file \