Open translation CSV in the text editor instead of printing errors.

Author: bruvzg

editor/editor_node.cpp

@@ -1528,7 +1528,12 @@ Error EditorNode::load_resource(const String &p_resource, bool p_ignore_broken_d
 	Error err;
 
 	Ref<Resource> res;
-	if (ResourceLoader::exists(p_resource, "")) {
+	if (force_textfile_extensions.has(p_resource.get_extension())) {
+		res = ResourceCache::get_ref(p_resource);
+		if (res.is_null() || !res->is_class("TextFile")) {
+			res = ScriptEditor::get_singleton()->open_file(p_resource);
+		}
+	} else if (ResourceLoader::exists(p_resource, "")) {
 		res = ResourceLoader::load(p_resource, "", ResourceFormatLoader::CACHE_MODE_REUSE, &err);
 	} else if (textfile_extensions.has(p_resource.get_extension())) {
 		res = ScriptEditor::get_singleton()->open_file(p_resource);
@@ -7825,6 +7830,8 @@ EditorNode::EditorNode() {
 		other_file_extensions.insert(E);
 	}
 
+	force_textfile_extensions.insert("csv"); // CSV translation source, has `Translation` resource type, but not loadable as resource.
+
 	resource_preview = memnew(EditorResourcePreview);
 	add_child(resource_preview);
 	progress_dialog = memnew(ProgressDialog);

editor/editor_node.h

@@ -475,6 +475,7 @@ class EditorNode : public Node {
 	SceneImportSettingsDialog *scene_import_settings = nullptr;
 	AudioStreamImportSettingsDialog *audio_stream_import_settings = nullptr;
 
+	HashSet<String> force_textfile_extensions;
 	HashSet<String> textfile_extensions;
 	HashSet<String> other_file_extensions;
 	HashSet<FileDialog *> file_dialogs;