Add catalan

src/main/java/com/faforever/client/i18n/I18n.java

@@ -62,6 +62,7 @@ private void loadAvailableLanguages() throws IOException {
         new Locale("iw"),
         new Locale("tr"),
         new Locale("nl"),
+        new Locale("cat"),
         Locale.ITALIAN,
         new Locale("pl")
     ));

src/test/java/com/faforever/client/i18n/I18nTest.java

@@ -2,6 +2,7 @@
 
 import com.faforever.client.preferences.Preferences;
 import com.faforever.client.preferences.PreferencesService;
+import lombok.extern.slf4j.Slf4j;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -11,15 +12,21 @@
 import org.mockito.junit.MockitoJUnitRunner;
 import org.springframework.context.support.ReloadableResourceBundleMessageSource;
 
+import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Locale;
+import java.util.stream.Stream;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.collection.IsCollectionWithSize.hasSize;
 import static org.junit.Assert.assertThat;
 import static org.mockito.Mockito.when;
 
 @RunWith(MockitoJUnitRunner.class)
+@Slf4j
 public class I18nTest {
 
   @Rule
@@ -103,7 +110,11 @@ public void rounded() {
   }
 
   @Test
-  public void getAvailableLanguages() {
-    assertThat(instance.getAvailableLanguages(), hasSize(13));
+  public void testLoadedLanguagesAreComplete() throws IOException {
+    final Path path = Paths.get("src", "main", "resources", "i18n");
+    try (Stream<Path> walk = Files.walk(path)) {
+      final long messageFileCount = walk.filter(path1 -> Files.isRegularFile(path1) && path.getFileName().toString().endsWith(".properties")).count();
+      assertThat(instance.getAvailableLanguages(), hasSize((int) messageFileCount));
+    }
   }
 }