[FIX]: Modify the language label of zh-hans

[findlayfeng]

'简化字' is not a commonly used term,
'简体中文' is the term accepted by most people.

<--- Put the description here --->

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)