message: Use sub for substitution variable name
diff: @@ -163,7 +163,7 @@ export default class KeyBackupPanel extends React.PureComponent {
  <p>{encryptedMessageAreEncrypted}</p>
  <p>{_t(
  "This device is <b>not backing up your keys</b>.", {},
  - {b: x => <b>{x}</b>},
  + {b: sub => <b>{sub}</b>},
  )}</p>
  <p>{_t("Back up your keys before signing out to avoid losing them.")}</p>
  </div>;
  @@ -270,7 +270,7 @@ export default class KeyBackupPanel extends React.PureComponent {
  <div>
  <p>{_t(
  "Your keys are <b>not being backed up from this device</b>.", {},
  - {b: x => <b>{x}</b>},
  + {b: sub => <b>{sub}</b>},
  )}</p>
  <p>{encryptedMessageAreEncrypted}</p>
  <p>{_t("Back up your keys before signing out to avoid losing them.")}</p>
  