Fix "cannot access dead object" error at startup
Fix "cannot access dead object" error at startup

This could happen if a second page was loaded quickly at startup, before
translators finished loading and detection ran on the first page.

rmzelle/zotero,gracile-fr/zotero,retorquere/zotero,rmzelle/zotero,gracile-fr/zotero,rmzelle/zotero,retorquere/zotero,gracile-fr/zotero,retorquere/zotero