Hey Yann,
If you referring EB, ED, KT latest language file update, you have to refer on the current latest version of these extension English language file.
e.g. JoomlaFolder/language/en-GB/en-GB.com_extensionName.ini
For other extension like ES2.1, EA, and Conversekit, I would suggest that you can temporary translate these main component language file first, once we already setup complete for those new translation platform, then you can upload your translated file to us, we will import over to this new translation platform.
e.g.
JoomlaFolder/language/en-GB/en-GB.com_easysocial.ini
JoomlaFolder/language/en-GB/en-GB.com_easyarticles.ini
JoomlaFolder/language/en-GB/en-GB.plg_system_conversekit.ini
JoomlaFolder/language/en-GB/en-GB.plg_system_conversekit.sys.ini
Regarding Komento, please take a look to attached picture "komento_1.jpg" and "komento_2.jpg", at the left window, you can see the file from YOUR Server, and at the right side / right window, the currently file located on Transifex Server: a lot of files are missing on Transifex, this is why I think that before starting a translation, you firstly need to update the Transifex Server with your latest files !!!
Regarding EasyDiscuss, it's exactly the same probleme: take a look to attached picture "easydiscuss.jpg" and you can see TONE AND TONE of missing fields on Transifex Server.
Hm, unfortunately that was not possible to update those new language constants into Transifex since we already decided to move out to another new translation platform.
By the way, take a look to attached picture "easysocial.jpg" and you can see that some of languages are missing on the backend, just to inform you of this probleme, even if it's not the right place to report it :-)
These language constant shouldn't be exist in EasySocial 2.1 and this bug already fixed in Beta version.
Since your development site already updated alpha at the first time, so it will not able to run the maintenance script automatically during the installation.
What you need to do this manually removed following file on your site.
JoomlaFolder/components/com_easysocial/themes/default/settings/form/pages/general/login.php
JoomlaFolder/components/com_easysocial/themes/default/settings/form/pages/stream/pagination.php
JoomlaFolder/components/com_easysocial/defaults/sidebar/access.json
JoomlaFolder/components/com_easysocial/defaults/sidebar/maintenance.json