Using custom label or mlang tag in Header

I checked the forum. There was another post with the exact same question but alas no answer to it.
I cannot seem to get {$custom CHANGE_LOCATION} in the header on a button label. It does not convert to anything it just displays {$custom CHANGE_LOCATION} as the button label.
I tried adding a message tag in the ENG.LNG file and putting the {mlang_message tag="CHANGE_LOCATION"} in the label value but it just shows {mlang_message tag="CHANGE_LOCATION"}
Is there an issue with using this in the header or footer??.

How do I get a multi-language value on a button Im using in the header.