feat: add descriptions for i18n messages (#815)

It fixes: openedx/frontend-wg/issues/74

src/courseware/course/sequence/hidden-after-due/messages.js

@@ -4,14 +4,17 @@ const messages = defineMessages({
   header: {
     id: 'learn.hiddenAfterDue.header',
     defaultMessage: 'The due date for this assignment has passed.',
+    description: 'Shown when content of a course is longer available because due date passed',
   },
   description: {
     id: 'learn.hiddenAfterDue.description',
     defaultMessage: 'Because the due date has passed, this assignment is no longer available.',
+    description: 'It explain why the content is not available',
   },
   gradeAvailable: {
     id: 'learn.hiddenAfterDue.gradeAvailable',
     defaultMessage: 'If you have completed this assignment, your grade is available on the {progressPage}.',
+    description: 'Text that precedes link that redirect to progress page',
   },
   progressPage: {
     id: 'learn.hiddenAfterDue.progressPage',

src/courseware/course/sequence/honor-code/HonorCode.jsx

@@ -48,6 +48,7 @@ function HonorCode({ intl, courseId }) {
             siteName,
             link: <a href={honorCodeUrl}>{intl.formatMessage(messages['learn.honorCode.name'])}</a>,
           }}
+          description="This is shown to learner, when course author wants to learners to explicity agree on their (Term of use or conduct), hence it links honor code page. "
         />
       </p>