Mail app do not use utf8 in mail folder description

Expected behavior

1. Open imap account with folders with non-ascii symbols in name
2. Click on three-dot button near folder name
3. Look at correct folder name

Actual behavior

....
3. "В москве" showed as "В москве"

When i choice "inspect element", in source code i see next

<strong data-v-8b05f97c="" class="action-text__title"> В москве </strong>
Here is screenshot

So its not a font issue, just miss call of some function (pay attention, that pop-up over this text is correct)

Mail app

Mail app version: (see apps admin page, e.g. 0.5.3)
1.0.0

Mailserver or service: (e.g. Outlook, Yahoo, Gmail, Exchange,...)
private imap

Server configuration

Operating system: (e.g. Debian 8)
centos 8
Web server: (e.g. Apache, Nginx,...)
nginx+php_frm
Database: (e.g. MariaDB, SQLite or PostgreSQL)
mariadb
PHP version: (e.g. 7.0)
7.2
Nextcloud Version: (see admin page, e.g. 13.0.2)
17.0.2

Client configuration

Browser: (e.g. Firefox 48)
Safari
Operating system: (e.g. Arch Linux)
os x catalina

Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.

Reproduce the issue by opening an IMAP account with a non-ASCII folder name and opening the three-dot folder action menu. Start at the menu's folder-name rendering and compare it with the correctly displayed popup text, checking where the name's UTF-8 encoding changes. Done means the folder name displays correctly in the menu as well as elsewhere.