Merge branch 'fix/locale-on-sidebar-label-assignment' into 'master'

Fix: locale issue on sidebar label assignment

See merge request gitlab-org/gitlab!97110

app/assets/javascripts/vue_shared/components/sidebar/labels_select_widget/dropdown_header.vue

@@ -80,6 +80,7 @@ export default {
       v-if="!showDropdownContentsCreateView"
       ref="searchInput"
       :value="searchKey"
+      :placeholder="__('Search labels')"
       :disabled="labelsFetchInProgress"
       data-qa-selector="dropdown_input_field"
       data-testid="dropdown-input-field"