Can anyone point out where the tx_noun_adj ("an") text is used so I know in what context to translate it?

It must be "na" or "na" depending on your language's order of nouns and adjectives.

na : weather is shown as "Day Cloudy"
an : weather is shown as "Cloudy Day"

Ah, okay - that clears it up - thanks... and there I was trying to find a loose "an" somewhere in the messages...