Migrate action, common, a11y translation keys

```
move () {
  FROM=$1 TO=$2 find public/locales -type f -exec sh -c 'jq ".$TO = .\"$FROM\" | del(.\"$FROM\") | del(..|nulls) | select(length > 0)" {} | sponge {}' \;
}

move "Avatar" "common.avatar"
move "Camera" "common.camera"
move "Close" "action.close"
move "Copied!" "common.copied"
move "Copy" "action.copy"
move "Copy link" "action.copy_link"
move "Encrypted" "common.encrypted"
move "Go" "action.go"
move "Home" "common.home"
move "Invite" "action.invite"
move "Loading…" "common.loading"
move "Microphone" "common.microphone"
move "No" "action.no"
move "Not encrypted" "common.unencrypted"
move "Password" "common.password"
move "Profile" "common.profile"
move "Username" "common.username"
move "Video" "common.video"
move "Register" "action.register"
move "Remove" "action.remove"
move "Settings" "common.settings"
move "Sign in" "action.sign_in"
move "Sign out" "action.sign_out"
move "Submit" "action.submit"
move "User menu" "a11y.user_menu"
move "Audio" "common.audio"
move "Display name" "common.display_name"
```

src/home/HomePage.tsx

@@ -25,7 +25,7 @@ import { usePageTitle } from "../usePageTitle";
 
 export const HomePage: FC = () => {
   const { t } = useTranslation();
-  usePageTitle(t("Home"));
+  usePageTitle(t("common.home"));
 
   const clientState = useClientState();
 

src/home/JoinExistingCallModal.tsx

@@ -40,7 +40,7 @@ export const JoinExistingCallModal: FC<Props> = ({
     <Modal title={t("Join existing call?")} open={open} onDismiss={onDismiss}>
       <p>{t("This call already exists, would you like to join?")}</p>
       <FieldRow rightAlign className={styles.buttons}>
-        <Button onPress={onDismiss}>{t("No")}</Button>
+        <Button onPress={onDismiss}>{t("action.no")}</Button>
         <Button onPress={onJoin} data-testid="home_joinExistingRoom">
           {t("Yes, join call")}
         </Button>

src/home/RegisteredView.tsx

@@ -147,7 +147,7 @@ export const RegisteredView: FC<Props> = ({ client }) => {
                 disabled={loading}
                 data-testid="home_go"
               >
-                {loading ? t("Loading…") : t("Go")}
+                {loading ? t("common.loading") : t("action.go")}
               </Button>
             </FieldRow>
             {optInAnalytics === null && (

src/home/UnauthenticatedView.tsx

@@ -177,8 +177,8 @@ export const UnauthenticatedView: FC = () => {
               <InputField
                 id="displayName"
                 name="displayName"
-                label={t("Display name")}
-                placeholder={t("Display name")}
+                label={t("common.display_name")}
+                placeholder={t("common.display_name")}
                 type="text"
                 required
                 data-testid="home_displayName"
@@ -209,7 +209,7 @@ export const UnauthenticatedView: FC = () => {
               disabled={loading}
               data-testid="home_go"
             >
-              {loading ? t("Loading…") : t("Go")}
+              {loading ? t("common.loading") : t("action.go")}
             </Button>
             <div id={recaptchaId} />
           </Form>