chore(i18n): add a translation for disk usage (#5916)

frontend/src/components/Sidebar.vue

@@ -92,7 +92,7 @@
     >
       <progress-bar :val="usage.usedPercentage" size="small"></progress-bar>
       <br />
-      {{ usage.used }} of {{ usage.total }} used
+      {{ $t("sidebar.diskUsed", { used: usage.used, total: usage.total }) }}
     </div>
 
     <p class="credits">

frontend/src/i18n/en.json

@@ -281,6 +281,7 @@
     "currentPassword": "Your Current Password"
   },
   "sidebar": {
+    "diskUsed": "{used} of {total} used",
     "help": "Help",
     "hugoNew": "Hugo New",
     "login": "Login",

frontend/src/i18n/pl.json

@@ -281,6 +281,7 @@
     "currentPassword": "Twoje aktualne hasło"
   },
   "sidebar": {
+    "diskUsed": "Wykorzystano {used} z {total}",
     "help": "Pomoc",
     "hugoNew": "Nowy Hugo",
     "login": "Zaloguj",