feat(members/waitinglist): add group age range info to invite text (#168)

Pass age info to group invite text as a parameter.

Reviewed-by: Christian Merten <christian@merten.dev>
Co-authored-by: marius.klein <marius.klein@alpenverein-heidelberg.de>
Co-committed-by: marius.klein <marius.klein@alpenverein-heidelberg.de>

jdav_web/members/locale/de/LC_MESSAGES/django.po

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-06-22 13:36+0200\n"
+"POT-Creation-Date: 2025-07-25 18:44+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -604,6 +604,15 @@ msgstr "Gruppe"
 msgid "groups"
 msgstr "Gruppen"
 
+#: members/models.py
+#, python-format
+msgid "years %(from)s to %(to)s"
+msgstr "Jahrgang %(from)s bis %(to)s"
+
+#: members/models.py
+msgid "no information available"
+msgstr "keine Angabe"
+
 #: members/models.py
 msgid "prename"
 msgstr "Vorname"

jdav_web/members/models.py

@@ -124,6 +124,15 @@ class Group(models.Model):
                                                              end_time=self.end_time.strftime('%H:%M'))
         else:
             return ""
+    
+    def has_age_info(self):
+        return self.year_from and self.year_to
+    
+    def get_age_info(self):
+        if self.has_age_info():
+            return _("years %(from)s to %(to)s") % {'from':self.year_from, 'to':self.year_to}
+        else:
+            return ""
 
     def get_invitation_text_template(self):
         """The text template used to invite waiters to this group. This contains
@@ -136,8 +145,14 @@ class Group(models.Model):
             group_time = self.get_time_info()
         else:
             group_time = settings.GROUP_TIME_UNAVAILABLE_TEXT.format(contact_email=self.contact_email)
+        if self.has_age_info():
+            group_age = self.get_age_info()
+        else:
+            group_age = _("no information available")
+        
         return settings.INVITE_TEXT.format(group_time=group_time,
                                            group_name=self.name,
+                                           group_age=group_age,
                                            group_link=group_link,
                                            contact_email=self.contact_email)