Add option to clear the server cache (#487)

src/i18n/locale/en.json

@@ -566,6 +566,14 @@
       },
       "title": "Backup"
     },
+    "clear_cache": {
+      "label": {
+        "description": "The cache of the client (browser, electron) should get cleared alongside it, otherwise, the client cache will keep getting used",
+        "failure": "Could not clear the server cache",
+        "success": "Cleared the server cache",
+        "title": "Clear server cache"
+      }
+    },
     "label": {
       "dark_theme": "Dark theme",
       "language_description": "Feel free to translate the project on",