Modify into note on start page

I couldn't find the place where that text is mantained. So I just leave it here. You'll know what to do!

Current text is:

I suggest this text:

Welcome to the new TYPO3 Extension Repository

After 7 months of preparing and refactoring we are happy to present the new TYPO3 Extension Repository (TER). It was launched on 23th of August 2017 and is still under construction. So you may find things that aren't really working or should do better. Please let us know! File an issue at https://git-t3o.typo3.org/t3o/ter/issues. We also appreciate feedback and suggestions very much. Use your typo3.org credentials to login. Enjoy!