Add dropdown title to issue board switcher

ee/app/assets/javascripts/boards/components/boards_selector.vue

@@ -220,7 +220,13 @@ export default {
         :text="board.name"
         @show="loadBoards"
       >
-        <gl-dropdown-header>
+        <div>
+          <div class="dropdown-title mb-0" @mousedown.prevent>
+            {{ s__('IssueBoards|Switch board') }}
+          </div>
+        </div>
+
+        <gl-dropdown-header class="mt-0">
           <gl-search-box v-if="!loading" ref="searchBox" v-model="filterTerm" />
         </gl-dropdown-header>
 

locale/gitlab.pot

@@ -5025,6 +5025,9 @@ msgstr ""
 msgid "IssueBoards|Some of your boards are hidden, activate a license to see them again."
 msgstr ""
 
+msgid "IssueBoards|Switch board"
+msgstr ""
+
 msgid "Issues"
 msgstr ""