Issue #3023452 by Lendude, ckaotik: Views placeholder texts are not translatable

core/modules/views/config/schema/views.filter.schema.yml

@@ -74,7 +74,7 @@ views.filter.string:
           type: boolean
           label: 'Required'
         placeholder:
-          type: string
+          type: label
           label: 'Placeholder'
     value:
       type: string
@@ -89,13 +89,13 @@ views.filter.numeric:
       label: 'Exposed'
       mapping:
         min_placeholder:
-          type: string
+          type: label
           label: 'Min placeholder'
         max_placeholder:
-          type: string
+          type: label
           label: 'Max placeholder'
         placeholder:
-          type: string
+          type: label
           label: 'Placeholder'
 
 views.filter_value.numeric:

core/modules/views/views.post_update.php

@@ -381,3 +381,11 @@ function views_post_update_exposed_filter_blocks_label_display(&$sandbox = NULL)
     return FALSE;
   });
 }
+
+/**
+ * Rebuild cache to allow placeholder texts to be translatable.
+ */
+function views_post_update_make_placeholders_translatable() {
+  // Empty update to cause a cache rebuild to allow placeholder texts to be
+  // translatable.
+}