Merge branch 'ticket/11723' into 'develop'

prevent negative delai*

See merge request geocontrib/geocontrib-frontend!15

src/views/project/Project_edit.vue

@@ -73,6 +73,7 @@
             <input
               type="number"
               min="0"
+              oninput="validity.valid||(value='');"
               style="padding: 1px 2px"
               name="archive_feature"
               id="archive_feature"
@@ -88,6 +89,7 @@
             <input
               type="number"
               min="0"
+              oninput="validity.valid||(value='');"
               style="padding: 1px 2px"
               name="delete_feature"
               id="delete_feature"