Check locales only on develop

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

.gitlab-ci.yml

@@ -28,6 +28,8 @@ check-trad:
     - git status > /dev/null 2>&1
     - export CHANGES=$(git diff-files --shortstat)
     - if [[ $CHANGES != $ORIG ]]; then echo "*** There is changes in locales ***"; echo "*** You need to do `make pull-locales` in your repo ***"; exit 1; fi
+  only:
+    - develop
 
 # Create artifacts on master
 pages: