Some languages ignored when importing TBX

I'm not very familiar with TBX, but according to a DTD validation, this should be valid TBX (TBX-Basic, actually):

```


English term
German term
S


```

I can import this to the German translation and it works as expected, but when I import it to the Spanish translation, the German term gets imported as translation. It seems as if the `xml:lang` is ignored.
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