упорядочил папки с кодом.

src/Common/Passes/All/SetSelectedFilesLanguage.java

@@ -0,0 +1,21 @@
+package Common.Passes.All;
+import Common.Current;
+import ProjectData.Files.DBProjectFile;
+import ProjectData.LanguageName;
+import Common.Passes.FilesMassPass;
+public class SetSelectedFilesLanguage extends FilesMassPass<LanguageName> {
+    @Override
+    protected boolean canStart(Object... args) throws Exception {
+        if (super.canStart(args)) {
+            target = (LanguageName) args[0];
+            return true;
+        }
+        return false;
+    }
+    @Override
+    protected void operation(DBProjectFile file) {
+        file.UpdateLanguage(target);
+        if (Current.HasFile() && file.file.equals(Current.getFile().file))
+            file.form.ShowLanguage();
+    }
+}