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/settings/FeedbackSettingsTab.tsx

@@ -97,7 +97,7 @@ export const FeedbackSettingsTab: FC<Props> = ({ roomId }) => {
               </FieldRow>
             )}
             <Button type="submit" disabled={sending}>
-              {sending ? t("Submitting…") : t("Submit")}
+              {sending ? t("Submitting…") : ("action.submit")}
             </Button>
           </FieldRow>
         )}

src/settings/ProfileSettingsTab.tsx

@@ -82,7 +82,7 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
           <AvatarInputField
             id="avatar"
             name="avatar"
-            label={t("Avatar")}
+            label={t("common.avatar")}
             avatarUrl={avatarUrl}
             userId={userId}
             displayName={displayName}
@@ -94,7 +94,7 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
         <InputField
           id="userId"
           name="userId"
-          label={t("Username")}
+          label={t("common.username")}
           type="text"
           disabled
           value={client.getUserId()!}
@@ -104,11 +104,11 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
         <InputField
           id="displayName"
           name="displayName"
-          label={t("Display name")}
+          label={t("common.display_name")}
           type="text"
           required
           autoComplete="off"
-          placeholder={t("Display name")}
+          placeholder={t("common.display_name")}
           defaultValue={displayName}
           data-testid="profile_displayname"
         />

src/settings/SettingsModal.tsx

@@ -121,11 +121,11 @@ export const SettingsModal: FC<Props> = (props) => {
       title={
         <>
           <AudioIcon width={16} height={16} />
-          <span className={styles.tabLabel}>{t("Audio")}</span>
+          <span className={styles.tabLabel}>{t("common.audio")}</span>
         </>
       }
     >
-      {generateDeviceSelection(devices.audioInput, t("Microphone"))}
+      {generateDeviceSelection(devices.audioInput, t("common.microphone"))}
       {!isFirefox() &&
         generateDeviceSelection(devices.audioOutput, t("Speaker"))}
     </TabItem>
@@ -137,11 +137,11 @@ export const SettingsModal: FC<Props> = (props) => {
       title={
         <>
           <VideoIcon width={16} height={16} />
-          <span>{t("Video")}</span>
+          <span>{t("common.video")}</span>
         </>
       }
     >
-      {generateDeviceSelection(devices.videoInput, t("Camera"))}
+      {generateDeviceSelection(devices.videoInput, t("common.camera"))}
     </TabItem>
   );
 
@@ -151,7 +151,7 @@ export const SettingsModal: FC<Props> = (props) => {
       title={
         <>
           <UserIcon width={15} height={15} />
-          <span>{t("Profile")}</span>
+          <span>{t("common.profile")}</span>
         </>
       }
     >
@@ -251,7 +251,7 @@ export const SettingsModal: FC<Props> = (props) => {
 
   return (
     <Modal
-      title={t("Settings")}
+      title={t("common.settings")}
       className={styles.settingsModal}
       open={props.open}
       onDismiss={props.onDismiss}