Hi
You can translate this text in module config. But if you wwant we will help you translate it in file language .ini
Please help me find and open file modules/mod_jo_instagram_photo_gallery/tmpl/default.php and go to line 54 and change
btname:"<?php echo $params->get('name_button')?>",
To
btname:"<?php echo JText::_('MOD_JO_INSTAGRAM_PHOTO_GALLERY_CUSTOM_BT');?>",
and translate this text
MOD_JO_INSTAGRAM_PHOTO_GALLERY_CUSTOM_BT = "" in file language.ini
And we will send you a version updated to email for you
Best regards
Bach Pham