chore: [MICROBA-1780] Copy edits (#901)

A partner was not happy with messaging for a course whose
students were in the "earned-not-available" state. This aims to make the
messaging more clear.

src/course-home/progress-tab/certificate-status/CertificateStatus.jsx

@@ -157,7 +157,7 @@ function CertificateStatus({ intl }) {
         body = (
           <FormattedMessage
             id="courseCelebration.certificateBody.notAvailable.endDate"
-            defaultMessage="This course ends on {endDate}. Final grades and certificates are
+            defaultMessage="This course ends on {endDate}. Final grades and any earned certificates are
             scheduled to be available after {certAvailabilityDate}."
             description="This shown for leaner when they are eligible for certifcate but it't not available yet, it could because leaners just finished the course quickly!"
             values={{ endDate, certAvailabilityDate }}

src/course-home/progress-tab/certificate-status/messages.js

@@ -92,8 +92,8 @@ const messages = defineMessages({
     description: 'Button text which leaner needs to upgrade to get the certifcate',
   },
   unverifiedHomeHeader: {
-    id: 'progress.certificateStatus.unverifiedHomeHeader',
-    defaultMessage: 'Verify your identity to earn a certificate!',
+    id: 'progress.certificateStatus.unverifiedHomeHeader.v2',
+    defaultMessage: 'Verify your identity to qualify for a certificate.',
     description: 'Header text when the learner needs to do verification to earn a certifcate ',
   },
   unverifiedHomeButton: {