I have the same problem with my site. Only some text is translated by WP but nothing from Vantage theme.
I make all changes from you say but nothing changed. My language is romanian and my site is still in english.
– in config.php I put ro_RO
– make child theme of Vantage
– make functions.php with you descibed
– make languages folder and put ro_RO.po and ro_RO.mo
What I wrong?
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