Add mobile only header

Add mobile only header for
pipeline actions cell.

app/assets/javascripts/pipelines/components/pipelines_list/pipelines_table.vue

@@ -70,7 +70,6 @@ export default {
     },
     {
       key: 'actions',
-      label: '',
       thClass: DEFAULT_TH_CLASSES,
       tdClass: DEFAULT_TD_CLASS,
       columnClass: 'gl-w-20p',
@@ -190,6 +189,7 @@ export default {
       fixed
     >
       <template #head(actions)>
+        <span class="gl-display-block gl-lg-display-none!">{{ s__('Pipeline|Actions') }}</span>
         <slot name="table-header-actions"></slot>
       </template>
 

locale/gitlab.pot

@@ -22334,6 +22334,9 @@ msgstr ""
 msgid "Pipelines|parent"
 msgstr ""
 
+msgid "Pipeline|Actions"
+msgstr ""
+
 msgid "Pipeline|Branch name"
 msgstr ""