Add message localization tests

These tests require building with the `localize-messages` feature.

If certain translations are updated, this test might fail, either
because a message was changed in the source, or because a translation of
a message was changed, or because a translation was added in a language
which previously did not have a translation for a particular message,
and we rely on that in the test. If any of these happen, the tests need
to be updated accordingly.

Closes #11726

.github/workflows/main.yml

@@ -166,7 +166,7 @@ jobs:
     - name: cmake
       run: |
         mkdir build && cd build
-        cmake -DWITH_GETTEXT=NO -DCMAKE_BUILD_TYPE=Debug ..
+        cmake -DCMAKE_BUILD_TYPE=Debug ..
     - name: make
       run: |
         make -C build VERBOSE=1