I have English installed.
php flarum info output:
Flarum core 0.1.0-beta.13
PHP version: 7.2.24-0ubuntu0.18.04.6
Loaded extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, pcntl, Reflection, SPL, sodium, session, standard, mysqlnd, PDO, xml, bcmath, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, json, exif, mysqli, pdo_mysql, Phar, posix, readline, shmop, SimpleXML, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, Zend OPcache
+---------------------------------+----------------+------------------------------------------+
| Flarum Extensions | | |
+---------------------------------+----------------+------------------------------------------+
| ID | Version | Commit |
+---------------------------------+----------------+------------------------------------------+
| flarum-approval | v0.1.0-beta.13 | |
| flarum-bbcode | v0.1.0-beta.12 | |
| flarum-emoji | v0.1.0-beta.13 | |
| flarum-lang-english | v0.1.0-beta.13 | |
| flarum-flags | v0.1.0-beta.13 | |
| flarum-likes | v0.1.0-beta.13 | |
| flarum-lock | v0.1.0-beta.13 | |
| flarum-markdown | v0.1.0-beta.13 | |
| flarum-mentions | v0.1.0-beta.13 | |
| flarum-statistics | v0.1.0-beta.13 | |
| flarum-sticky | v0.1.0-beta.13 | |
| flarum-subscriptions | v0.1.0-beta.13 | |
| flarum-suspend | v0.1.0-beta.13 | |
| flarum-tags | v0.1.0-beta.13 | |
| noriods-auto-more | 0.3.0 | |
| clarkwinkelmann-circle-groups | 0.2.1 | |
| michaelbelgium-discussion-views | v4.0.0 | ... |
| fof-ban-ips | 0.2.0 | ... |
| fof-disposable-emails | 0.1.0 | ... |
| fof-drafts | 0.1.11 | ... |
| fof-links | 0.3.0 | |
| fof-merge-discussions | 0.3.3 | ... |
| fof-polls | 0.1.2 | |
| fof-profile-image-crop | 0.1.1 | ... |
| fof-pwned-passwords | 0.4.0 | ... |
| fof-socialprofile | 0.1.2 | ... |
| fof-spamblock | 0.2.2 | ... |
| fof-stopforumspam | 0.2.2 | ... |
| fof-username-request | 0.2.0 | ... |
| fof-recaptcha | 0.1.2 | |
| michaelbelgium-profile-views | v3.0.0 | |
| reflar-webhooks | 0.2.3 | |
| v17development-seo | 1.2.1 | |
| fof-geoip | 0.1.7 | ... |
| fof-sitemap | 0.5.1 | ... |
| fof-formatting | 0.1.4 | ... |
| fof-follow-tags | 0.3.4 | |
| fof-auth-discord | 0.1.3 | ... |
+---------------------------------+----------------+------------------------------------------+
Base URL: https://...
Installation path: /var/www/.../forum
Debug mode: off
