gettext.w.o: Support for baldras.w.o instead of asheviere.w.o

* Adjusted file and directory paths to match the httpd facility's
  layout
* Replace campaigns.wesnoth.org host references with a LAN address
* Removed tasks to update the mainline Git working trees, they are
  not writeable by us anymore
gettext.wesnoth.org: Restore website repository auto-pull
gettext.w.o: cd into gettext.w.o before running grab-stats

Otherwise we are unable to run it in the first place. Oops.
gettext.w.o: Don't require bash to run update-gettext-stats

This script is portable and doesn't make use of any bash-specific
features.