change removeUnusedKeys to false

When I regenerated the translation data, some usable translation data disappeared.
Some data seemed incompatible with the new display, and some data, despite being in use, didn't appear to be detected by i18next-scanner.

Therefore, it became necessary to set this setting to `false`.

Author: virusbb001

client/i18next-scanner.config.cjs

@@ -77,7 +77,16 @@ module.exports = {
   ],
   options: {
     debug: true,
-    removeUnusedKeys: true,
+    /**
+     * For example, the return value of a `TabTitle` element is
+     * subject to translation, but it is removed because it cannot
+     * be detected by i18next-scanner.
+     * 
+     * The relevant section will be displayed as a warning when
+     * `npm run translate` is executed, and resolving the warning
+     * will restore it to `true`.
+     */
+    removeUnusedKeys: false,
     func: {
       list: ['i18next.t', 'i18n.t', 't'],
       extensions: ['.js', '.jsx'] // not .ts or .tsx since we use i18next-scanner-typescript!
@@ -147,5 +156,4 @@ module.exports = {
       done();
     }
   ),
-
 };