Just one simple thing quickly noticed as of late while using the existing lang pack (
Version v 1.8.28 (stable) 2021-10-28, 07:56 AM) on 1830 while translating some plugins:
frontend side...
global.lang.php needs such added:
$l['expcol_collapse'] = '[-]';
$l['expcol_expand'] = '[+]';
admin side...
admin/config_badwords.lang.php
$l['add_bad_word_desc'] = "Ici, vous pouvez ajouter un filtre de mots et son remplacement.";
admin/config_banning.lang.php
$l['ban_an_ip_address'] = "Interdire une adresse IP";
etc, etc... as there may or may not be more missing upon further looking at such, but, just noting at least the first few warnings about such noticed in relation to subject matter and current usage.