fix: replace hardcoded strings and properly define i18n messages

src/containers/CourseFilterControls/CourseFilterControls.jsx

@@ -68,7 +68,7 @@ export const CourseFilterControls = ({
               onClose={close}
             >
               <div className="p-1 mr-3">
-                <b>Refine</b>
+                <b>{formatMessage(messages.refine)}</b>
               </div>
               <hr />
               <div className="filter-form-row">

src/containers/CourseFilterControls/messages.js

@@ -1,6 +1,6 @@
-import { StrictDict } from 'utils';
+import { defineMessages } from '@edx/frontend-platform/i18n';
 
-export const messages = StrictDict({
+const messages = defineMessages({
   inProgress: {
     id: 'learner-dash.courseListFilters.inProgress',
     description: 'in-progress filter checkbox label for course list filters',
@@ -52,4 +52,5 @@ export const messages = StrictDict({
     defaultMessage: 'Refine',
   },
 });
+
 export default messages;

src/containers/LearnerDashboardHeader/ExpandedHeader/AuthenticatedUserDropdown.jsx

@@ -29,9 +29,9 @@ export const AuthenticatedUserDropdown = () => {
           </span>
         </Dropdown.Toggle>
         <Dropdown.Menu className="dropdown-menu-right">
-          <Dropdown.Header>SWITCH DASHBOARD</Dropdown.Header>
+          <Dropdown.Header>{formatMessage(messages.dashboardSwitch)}</Dropdown.Header>
           <Dropdown.Item as="a" href="/edx-dashboard" className="active">
-            Personal
+            {formatMessage(messages.dashboardPersonal)}
           </Dropdown.Item>
           {!!dashboard && (
             <Dropdown.Item as="a" href={dashboard.url} key={dashboard.label}>

src/containers/LearnerDashboardHeader/messages.js

@@ -6,6 +6,16 @@ const messages = defineMessages({
     defaultMessage: 'Dashboard',
     description: 'The text for the user menu Dashboard navigation link.',
   },
+  dashboardPersonal: {
+    id: 'learnerVariantDashboard.menu.dashboardPersonal.label',
+    defaultMessage: 'Personal',
+    description: 'Link to personal dashboard in user menu',
+  },
+  dashboardSwitch: {
+    id: 'learnerVariantDashboard.menu.dashboardSwitch.label',
+    defaultMessage: 'SWITCH DASHBOARD',
+    description: 'Switch Dashboard header in the user menu',
+  },
   help: {
     id: 'learnerVariantDashboard.help.label',
     defaultMessage: 'Help',