Try to install msgcmp via the gettext package

.gitlab-ci.yml

@@ -60,7 +60,7 @@ translation:
       when: manual
   before_script:
   - *apt_get_update
-  - apt-get install --yes msgcmp > /dev/null
+  - apt-get install --yes gettext > /dev/null
   script:
     - files=$(find . -name strings.po -not -path './resources/language/resource.language.en_gb/*') && for file in files; do msgcmp $file ./resources/language/resource.language.en_gb/strings.po; done