Summary:
In Config > Core > Translations. If save Chinese JSON string like:
```
{
"Hello": "你好"
}
```
will be converted and saved to:
```
{
"Hello": "\u4f60\u597d"
}
```
Resolution:
change line 132:
```
return json_encode($value, JSON_UNESCAPED_SLASHES);
```
to:
```
return json_encode($value, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
```