We export Engagements via XLIFF API for localization. We started getting XLIFF plugin validation errors on the exported XLIFF en-US file due to the empty trgLang. 

<xliff srcLang="en-US" trgLang="" version="2.0"
 xmlns="urn:oasis:names:tc:xliff:document:2.0" xmlns:mda="urn:oasis:names:tc:xliff:metadata:2.0">

Because the en-US file doesn’t have a target, trgLang should not be there. 

<xliff srcLang="en-US" version="2.0"
 xmlns="urn:oasis:names:tc:xliff:document:2.0" xmlns:mda="urn:oasis:names:tc:xliff:metadata:2.0">

Even the screenshot in your documentation doesn’t have trgLang for the exported en-US file.

https://support.gainsight.com/PX/Engagements/04Localization/Engagement_Localization

Because this is preventing us from localizing engagements, could you please look into this?