.travis.runonce.bash: add msgcheck

&& requirements.txt: add msgcheck & forgotten sphinx.

.travis.runonce.bash

@@ -9,6 +9,8 @@ branch=$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')
 # Check translations
 sandbox/check_trans.py plugins/
 sandbox/check_trans.py --core
+msgcheck locales/*.po
+msgcheck plugins/*/*/*.po
 
 # Check documentation
 cd docs

requirements.txt

@@ -5,3 +5,5 @@ python-gnupg
 feedparser
 sqlalchemy
 SocksiPy-branch
+msgcheck
+sphinx