i18n characters are potentially not handled correctly

In localisation files, I was trying to use some i18n characters, but it raises some error.

```
Note: The error occurred at the end of the input stream.
Expecting: ':'
CW001(CW001)
```

I was looking for misses entirely, but I could not be found.
Then, I was trying to remove all i18n characters and the error disappeared.

Next, I was loading the errored file with a stellaris game, however, it correctly works.