Differentiate between different cases of editor voucher redemption

app/views/vouchers/_redeem_editor_voucher.html.erb

@@ -1,9 +1,11 @@
 <%= t('profile.become_editor', lecture: voucher.lecture.title) %>
-<%= link_to redeem_voucher_path(params: { secure_hash: voucher.secure_hash }),
-            class: 'btn btn-primary',
-            method: :post,
-            remote: true do %>
-  <%= t('profile.redeem_voucher') %>
+
+<% if current_user == voucher.lecture.teacher %>
+  <%= t('profile.teacher_cant_become_editor') %>
+<% elsif current_user.in?(voucher.lecture.editors_by_redemption) %>
+  <%= t('profile.already_editor_by_redemption') %>
+<% else %>
+  <%= redeem_voucher_button(voucher) %>
 <% end %>
-<%= link_to t('buttons.cancel'), cancel_voucher_path,
-            class: "btn btn-secondary ms-2", remote: true %>
+
+<%= cancel_voucher_button %>

config/locales/de.yml

@@ -2213,8 +2213,14 @@ de:
     already_tutor_by_redemption: >
       Du hast bereits einen Gutschein eingelöst, um TutorInnenstatus zu erhalten.
     become_editor: >
-      Mit diesem Gutschein kannst Du EditorInnenrechte für die Veranstaltung
-      %{lecture} übernehmen.
+      Mit diesem Gutschein erhältst Du EditorInnenstatus für die Veranstaltung
+      %{lecture}.
+    already_editor_by_redemption: >
+      Du hast bereits einen Gutschein eingelöst, um EditorInnenstatus zu
+      erhalten.
+    teacher_cant_become_editor: >
+      Du kannst nicht zusätzlich EditorInnenstatus in einer Veranstaltung
+      erhalten, in der Du bereits DozentIn bist.
   mampf_news:
     title: 'MaMpf-News'
     check_notifications: 'Alle erledigen'

config/locales/en.yml

@@ -2064,7 +2064,7 @@ en:
       We have received your request and will send you your data as soon as possible.
     redeem_voucher: Redeeem Voucher
     become_tutor: >
-      With this voucher, you can obatin tutor status for the %{lecture}.
+      With this voucher, you can obtain tutor status for %{lecture}.
       With that, editors for the event series can assign you tutorials.
       If applicable, you can select the tutorials you will be responsible for
       right here.
@@ -2085,7 +2085,12 @@ en:
     already_tutor_by_redemption: >
       You have already redeemed a tutor voucher for this event series.
     become_editor: >
-      With this voucher, you can become an editor in the event series %{lecture}.
+      With this voucher, you can obtain editor status for %{lecture}.
+    already_editor_by_redemption: >
+      You have already redeemed an editor voucher for this event series.
+    teacher_cant_become_editor: >
+      You are already a teacher for this event series. Therefore, you cannot
+      redeem an editor voucher.
   mampf_news:
     title: 'MaMpf News'
     check_notifications: 'Clear all'