delete extra files, fix youtube compatibility

dist/userscript/_locales/en/messages.json

@@ -0,0 +1,8 @@
+{
+  "app_name": {
+    "message": "KISS Translator (by Gabe)"
+  },
+  "app_description": {
+    "message": "A minimalist bilingual translation Extension & Greasemonkey Script"
+  }
+}

dist/userscript/_locales/zh/messages.json

@@ -0,0 +1,8 @@
+{
+  "app_name": {
+    "message": "简约翻译 (by Gabe)"
+  },
+  "app_description": {
+    "message": "一个简约的双语网页翻译扩展 & 油猴脚本"
+  }
+}