Incorporate i18n into UI elements (#1471)

* Update zh-tw string table (till 975343d2)
* Prepare localization table
* Implement i18n for Performers & Tags
* Add "add" action strings
* Use Lodash merge for deep merging language JSONs

The original implementation does not properly merge language files, causing unexpected localization string fallback behavior.

* Localize pagination strings
* Use Field name value as null id fallback

...otherwise FormattedMessage is gonna throw when the ID is null

* Use localized "Path" string for all instances
* Localize the "Interface" tab under settings
* Localize scene & performer cards
* Rename locale folder for better compatibility with i18n-ally
* Localize majority of the categories and features

ui/v2.5/src/components/Settings/SettingsToolsPanel.tsx

@@ -1,18 +1,25 @@
 import React from "react";
 import { Form } from "react-bootstrap";
+import { FormattedMessage } from "react-intl";
 import { Link } from "react-router-dom";
 
 export const SettingsToolsPanel: React.FC = () => {
   return (
     <>
-      <h4>Scene Tools</h4>
+      <h4>
+        <FormattedMessage id="config.tools.scene_tools" />
+      </h4>
 
       <Form.Group>
-        <Link to="/sceneFilenameParser">Scene Filename Parser</Link>
+        <Link to="/sceneFilenameParser">
+          <FormattedMessage id="config.tools.scene_filename_parser.title" />
+        </Link>
       </Form.Group>
 
       <Form.Group>
-        <Link to="/sceneDuplicateChecker">Scene Duplicate Checker</Link>
+        <Link to="/sceneDuplicateChecker">
+          <FormattedMessage id="config.tools.scene_duplicate_checker" />
+        </Link>
       </Form.Group>
     </>
   );