Fix showing translate button when status has no language in web UI (#19388)

app/javascript/mastodon/components/status_content.js

@@ -181,7 +181,7 @@ class StatusContent extends React.PureComponent {
     const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;
     const renderReadMore = this.props.onClick && status.get('collapsed');
     const renderViewThread = this.props.showThread && status.get('in_reply_to_id') && status.get('in_reply_to_account_id') === status.getIn(['account', 'id']);
-    const renderTranslate = this.context.identity.signedIn && this.props.onTranslate && ['public', 'unlisted'].includes(status.get('visibility')) && status.get('contentHtml').length > 0 && intl.locale !== status.get('language');
+    const renderTranslate = this.context.identity.signedIn && this.props.onTranslate && ['public', 'unlisted'].includes(status.get('visibility')) && status.get('contentHtml').length > 0 && status.get('language') !== null && intl.locale !== status.get('language');
     const language = preloadedLanguages.find(lang => lang[0] === status.get('language'));
     const languageName = language ? language[2] : status.get('language');