Translations update from Weblate

Translations update from Weblate for AlekSIS/AlekSIS-App-Alsijil-Frontend.

Current translation status:

aleksis/apps/alsijil/frontend/messages/ru.json

 {
+  "actions": {
+    "back_to_overview": "Назад к обзору"
+  },
   "alsijil": {
     "absence": {
       "menu_title": "Регистрация отсутствия"