Language issues with SharePoint online and Office 365

What's wrong, when you have set in SharePoint 2013 online all language and region settings to a language, but there are still appearing some labels/alerts, etc. in the previous language? Why does the language setting not work correctly?

A customer of mine had this issue. The solution is, that Microsoft installs the default language according to the country they are billing. That means a German billing address will get a German default language install. In combination with Office 365 there might be still some labels and alerts set to German, even when you changed all language and regional settings to e.g. English.

There is just one way to solve this. You will have to contact Microsoft and ask for a fresh install of your SharePoint 2013 online. This worked for my customer. It seems there is still the step missing, that Microsoft should ask the customer, which default install language they prefer.

Cannot start service spusercodev4 on computer

I tried to deploy a sandbox solution out of Visual Studio 2010 and received the following error:
cannot start service spusercodev4 on computer
Somehow the "Microsoft SharePoint Foundation Sandboxed Code Service" in Central Administration stopped.
Go to Central Administration -> System Settings -> Manage services on server and pick there the service mentioned above and restart. I read on another blog, that also the "Microsoft SharePoint Foundation User Code Service" service might cause this trouble. If my solution does not work, please refer to this blog:
http://blog.dennus.net/2009/11/18/sp2010-spusercodev4-your-new-web-part-project-isnt-deploying/