### Godot version

4.0.dev (ba9491f87)

### System information

Windows 11 Chrome 109.0.5414.75 (Official Build), iOS 16.2 Safari

### Issue description

When exporting a simple project for Web with any GDScript like following:
```gdscript
extends Control

```
will print the following error to the console:
```
USER ERROR: U_ILLEGAL_ARGUMENT_ERROR
   at: _is_confusable (modules\text_server_adv\text_server_adv.cpp:6151)
```

![image](https://user-images.githubusercontent.com/173001/214089154-d88f3f44-b670-41ec-9743-30627677968e.png)

For more complex project, following additional errors are showing:
```
USER ERROR: U_FILE_ACCESS_ERROR
   at: _spoof_check (modules\text_server_adv\text_server_adv.cpp:6174)
USER ERROR: U_ILLEGAL_ARGUMENT_ERROR
   at: _is_confusable (modules\text_server_adv\text_server_adv.cpp:6151)
```
When I've inserted `print_line(p_string)` at text_server_adv.cpp line 6172, following logs are collected:
![image](https://user-images.githubusercontent.com/173001/214091164-cb5af630-56d2-446e-b1c4-dc20066565d5.png)

It seems that the identifiers of *.gd files are printed to the console.


### Steps to reproduce

1. Open minimal reproduction project.
2. Exports to Web.
3. Open exported site with Chrome and open developer console.
4. Following error logs will be seen (reproduced): `USER ERROR: U_ILLEGAL_ARGUMENT_ERROR`

### Minimal reproduction project

[text_server_adv_error.zip](https://github.com/godotengine/godot/files/10481582/text_server_adv_error.zip)

}
			}
			word_length += 1;
			if (p_chars_per_line > 0) {
				if (word_length > p_chars_per_line) {
					// Word too long: wrap before current character.
					ret.push_back(line_start);
					ret.push_back(i);
					line_start = i;
					line_end = i;
					word_start = i;
					word_length = 1;
				ine) {
					// Line too long: wrap after the last word.
					ret.push_back(line_start);
					);
					line_start = word_start;
					line_end = line_start;
				}
			}
		}
	}
	if (line_start < p_string.length()) {
		ret.push_back(line_start);
		ret.push_back(p_string.length());
	}
	return ret;
}
bool TextServerAdvanced::_is_valid_identifier(const String &p_string) const {
	enum UAX31SequenceStatus {