[TYPO3] Typo3 4.0 tt_news in German in the backend?

[Another Vision]

Hi All

Just starting a typo3 4.0 site for the first time (having worked with 3.7 on
a few sites before), but when I installed the trusty tt_news extension (v
2.4.0) the extension interface appears in German in the back-end.

Have I missed something glaringly obvious?

Mike