passman can't export entries

EDIT : it works in Chrome with the hack https://github.com/nextcloud/passman/wiki/Exporting%3Aa-single-users-credentials In Firefox : says it's done but no file to save visible

Bug report

Steps to reproduce

Export vault data 2.CSV or JSON
pass OK
Démarrage de l'export Déchiffrement des informations d'identification
nothing happens

Expected behaviour

export file

Actual behaviour

nothing happens

Configuration

nextcloud 12 on PHP

Browser:
tried Firefox 59.0.2 & Chromium 65.0.3325.181

Extensions that might cause interference: ??

Passman version: 2.1.4

Operating system: ubuntu 14

Web server: Linux

Database: SQL

PHP version: 5.6

cloud server: Nextcloud

cloud version: (see admin page or version.php)

Browser log not sure I've got the correct debugger

Browser log

TypeError: browser.contextMenus is undefined background.js:3:1 Erreur dans les liens source : request failed with status 404 URL de la ressource : https://site.org/nextcloud/core/vendor/core.js?v=xxxxxxxxxxfbe-0 URL du lien source : purify.min.js.map[En savoir plus] (source inconnue) DebuggeeWouldRun: debuggee `https://site.org/nextcloud/core/vendor/core.js?v=xxxfbe-0:3' would run script.js:356:5

Cloud log

{"reqId":"yKVCSmtDTYmmIezb8R5W","level":3,"time":"2018-05-01T19:09:50+00:00","remoteAddr":"2a01:e35:8794:8300:aa0d:6bbb:6e24:5592","user":"xx","app":"PHP","method":"GET","url":"/nextcloud/index.php/apps/passman/api/v2/language?lang=en","message":"vsprintf(): Too few arguments at /srv/data/web/vhosts/xx.org/htdocs/nextcloud/lib/private/legacy/l10n/string.php#72","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/65.0.3325.181 Chrome/65.0.3325.181 Safari/537.36","version":"12.0.4.3"}

{"reqId":"dr7hGfjzhgugnRC0oavR","level":3,"time":"2018-05-01T19:23:23+00:00","remoteAddr":"2a01:e35:8794:8300:aa0d:6bbb:6e24:5592","user":"xx","app":"PHP","method":"GET","url":"/nextcloud/index.php/apps/passman/api/v2/language?lang=en","message":"Method OC_L10N_String::__toString() must return a string value at /srv/data/web/vhosts/xx.org/htdocs/nextcloud/lib/private/L10N/L10N.php#85","userAgent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0","version":"12.0.4.3"}

thanks

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