Update `Chinese (Simplified) (zh-hans)` translation

Currently translated at 100.0% (612 of 612 strings)

Translation: Wiki-Bot/Discord
Translate-URL: https://translate.wikibot.de/projects/wiki-bot/discord/zh-hans/

i18n/zh-hans.json

@@ -578,6 +578,7 @@
         "wiki": "wiki："
     },
     "search": {
+        "cached": "缓存上次更新：",
         "category": {
             "content": "分类下的内容：",
             "empty": "*空白分类*",