Add `isProject` and computed props to for contextual info for dropdown

app/assets/javascripts/vue_shared/components/sidebar/labels_select/base.vue

 <script>
+import { __ } from '~/locale';
 import LabelsSelect from '~/labels_select';
 import LoadingIcon from '../../loading_icon.vue';
 
@@ -31,6 +32,11 @@ export default {
       required: false,
       default: false,
     },
+    isProject: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
     abilityName: {
       type: String,
       required: true,
@@ -73,6 +79,20 @@ export default {
     hiddenInputName() {
       return this.showCreate ? `${this.abilityName}[label_names][]` : 'label_id[]';
     },
+    createLabelTitle() {
+      if (this.isProject) {
+        return __('Create project label');
+      }
+
+      return __('Create group label');
+    },
+    manageLabelsTitle() {
+      if (this.isProject) {
+        return __('Manage project labels');
+      }
+
+      return __('Manage group labels');
+    },
   },
   mounted() {
     this.labelsDropdown = new LabelsSelect(this.$refs.dropdownButton, {
@@ -137,10 +157,14 @@ dropdown-menu-labels dropdown-menu-selectable"
             <dropdown-footer
               v-if="showCreate"
               :labels-web-url="labelsWebUrl"
+              :create-label-title="createLabelTitle"
+              :manage-labels-title="manageLabelsTitle"
             />
           </div>
           <dropdown-create-label
             v-if="showCreate"
+            :is-project="isProject"
+            :header-title="createLabelTitle"
           />
         </div>
       </div>

spec/javascripts/vue_shared/components/sidebar/labels_select/base_spec.js

@@ -37,6 +37,32 @@ describe('BaseComponent', () => {
         vmNonEditable.$destroy();
       });
     });
+
+    describe('createLabelTitle', () => {
+      it('returns `Create project label` when `isProject` prop is true', () => {
+        expect(vm.createLabelTitle).toBe('Create project label');
+      });
+
+      it('return `Create group label` when `isProject` prop is false', () => {
+        const mockConfigGroup = Object.assign({}, mockConfig, { isProject: false });
+        const vmGroup = createComponent(mockConfigGroup);
+        expect(vmGroup.createLabelTitle).toBe('Create group label');
+        vmGroup.$destroy();
+      });
+    });
+
+    describe('manageLabelsTitle', () => {
+      it('returns `Manage project labels` when `isProject` prop is true', () => {
+        expect(vm.manageLabelsTitle).toBe('Manage project labels');
+      });
+
+      it('return `Manage group labels` when `isProject` prop is false', () => {
+        const mockConfigGroup = Object.assign({}, mockConfig, { isProject: false });
+        const vmGroup = createComponent(mockConfigGroup);
+        expect(vmGroup.manageLabelsTitle).toBe('Manage group labels');
+        vmGroup.$destroy();
+      });
+    });
   });
 
   describe('methods', () => {