Ah, the sign in and out glitch. Okay, so first you'll need to be sure of what your account email and password is. It's a pretty easy fix. All you have to do is remove your XBL profile from the x-box, clear your system cache, restart your console, and redownload your account. Here's how.
To delete your profile:
Go to Xbox Home.
Go all the way to the right to the Settings tab, Select System, Storage, Hard Drive, then Profiles.
Find your gamertag and delete it. MAKE SURE TO SELECT 'DELETE PROFILE ONLY'. If you select 'Delete Profile and Items', you'll remove all the stuff that's associated with your gamertag (i.e. DLC and such). It will be difficult to get back.
To clear your cache:
Go back to the Storage Devices page, where it shows Hard Drive and Cloud Storage. Highlight Hard Drive with the green selection bar and press Y on your controller.
Select Clear System Cache, then Yes.
Go back to Xbox Home.
Restart your console. (Turn it off, then back on.)
To redownload your gamertag:
Press the center button and select Sign In.
Select Download Profile.
Enter in your Gamertag's email and password
Select Remember Password
That should solve the signing in and out issue. As far as your English/Deustch issue goes, that could be more convoluted. There's many areas of failure to this issue, so I'll try the most common one.
ON YOUR XBOX:
Go to Settings, Console Settings, Language and Locale
Make sure that it says English/Australia (or whatever language you prefer and where you're at)
Once that's taken care of, now move onto a computer and go to xbox.com and sign into your gamertag. Make sure the page is displaying in English. If it isn't, then on the top right of the page click the two words underneath your gamertag. Scroll towards the bottom of the page to find a table containing three black phrases. Google translate should be able to help you find the one that says 'Other' in English. Underneath the one that says 'Other', five down, second one from the bottom, click the phrase and select the country you're currently in.
You may run into an 'I'm Moving' page, in which case use google translate to the best of your ability to navigate and change your region. That should do it.
Well, it started when I was changing names in the shoutbox. I changed Jack of Harts name to DMinion1, and he wanted to keep it.
Then I changed Caboose and H5 Follower's names as well, and they wanted to keep them too.
Soon others were joining in, and Jack began creating signatures for them. Now he has Austinatious' help as well.
That's pretty much it.