Change texts in info alert

aleksis/apps/chronos/frontend/messages/en.json

@@ -48,8 +48,8 @@
         "menu_title": "Plan substitution lessons",
         "title_plural": "Plan substitution lessons",
         "info_alert": {
-          "text": "This page shows all lessons that collide with known absences of their respective teachers. To add or edit absences, use the page provided by the respective app. ",
-          "button": "Add/edit absences"
+          "text": "This page shows all lessons that collide with known absences of their respective teachers.",
+          "button": "Manage absences"
         },
         "filter": {
           "groups": "Filter by groups"