Update devops adoption table title

ee/app/assets/javascripts/admin/dev_ops_report/constants.js

@@ -21,7 +21,7 @@ export const DEVOPS_ADOPTION_STRINGS = {
     ),
     tableHeader: {
       text: s__(
-        'DevopsAdoption|Feature adoption is based on usage over the last 30 days. Last updated: %{timestamp}.',
+        'DevopsAdoption|Feature adoption is based on usage in the last calendar month. Last updated: %{timestamp}.',
       ),
       button: s__('DevopsAdoption|Add new segment'),
     },

ee/spec/frontend/admin/dev_ops_report/components/devops_adoption_app_spec.js

@@ -348,7 +348,7 @@ describe('DevopsAdoptionApp', () => {
 
         it('displays the header text', () => {
           const text =
-            'Feature adoption is based on usage over the last 30 days. Last updated: 2020-10-31 23:59.';
+            'Feature adoption is based on usage in the last calendar month. Last updated: 2020-10-31 23:59.';
           expect(getByText(wrapper.element, text)).not.toBeNull();
         });
 

locale/gitlab.pot

@@ -9622,7 +9622,7 @@ msgstr ""
 msgid "DevopsAdoption|DevOps adoption uses segments to track adoption across key features. Segments are a way to track multiple related projects and groups at once. For example, you could create a segment for the engineering department or a particular product team."
 msgstr ""
 
-msgid "DevopsAdoption|Feature adoption is based on usage over the last 30 days. Last updated: %{timestamp}."
+msgid "DevopsAdoption|Feature adoption is based on usage in the last calendar month. Last updated: %{timestamp}."
 msgstr ""
 
 msgid "DevopsAdoption|Issues"