Update rebuild-translation-sources to run from project root

scripts/rebuild-translation-sources.sh

@@ -1,8 +1,8 @@
 # Delete old translation sources
-find ../wagtail -iname *.po -iwholename */en/* -delete
+find ./wagtail -iname *.po -iwholename */en/* -delete
 
 # Run makemessages on each app
-for d in $(find ../wagtail -iwholename */locale/* | sed 's|\(.*\)/locale.*|\1|' | sort -u);
+for d in $(find ./wagtail -iwholename "*/locale/*" | sed 's|\(.*\)/locale.*|\1|' | sort -u);
 do
     pushd $d
     django-admin makemessages --locale=en --ignore=test/* --ignore=tests/* --ignore=tests.py
@@ -10,6 +10,6 @@ do
 done
 
 # Extract translatable strings from JavaScript
-pushd ../client
+pushd ./client
 node extract-translatable-strings.js
 popd