Welcome to PCHF conn!
It seems as though the language settings have been changed. Do your emails show up in chinese?
To try and fix this:
Open Gmail
Click Settings (might be named something else but will be in the position as above). Then go down and look for a drop-down box with languages in and select English.
Then go to the bottom of the page and click the right hand button to accept and then the left hand button on the window that pops up.
That should solve your problem.