Hi,
1) if you want to change the string then goto the
loco translate >> plugins and find these strings there.
if any issue occur then create topic in translation section. our translation expert will help you out.
2)
Please goto wp-admin >>> appearance >>> customize >>> custom css >>> paste & save.
.groups div#item-header div#item-meta a.group-button.join-group{background: #0e4cf7; color: white; font-size: 14px; border: solid 2px white;}
.groups div#item-header div#item-meta a.group-button.join-group:hover{ transform: translateY(-3px); transition: all ease-in-out 0.3s;}
refer:
http://prntscr.com/nywhyq
There is not yet implemented
separate batches page to filter groups to batches and
join button for batches in course page, you can click any batches to goto batch page where you will see batch join button.