### Godot version

v4.2.dev4.official [549fcce5f]

### System information

Ubuntu 20.04 LTS

### Issue description

See title.

### Steps to reproduce

1. Create a new project
2. Create a csv file that includes the following
```
key,ar
key,placeholder
```
3. Add the generated `.translation` file to Project -> Project Settings... -> Localization
4. In Project -> Project Settings... -> Internationalization -> Locale, set `Test` to `ar`
5. Add a `LineEdit` node and type `-=[]{}`
6. Run the project, and notice that the text is on the right side, but the symbols are incorrectly in LTR (`-=[]{}`).  Correct output is `{}[]=-`
7. Back in the editor, add a single Arabic letter (any will do), and notice that `LineEdit` immediately (and correctly) flips the symbols, and the newly-added Arabic letter, to RTL.

**Notes**
- Identical behavior is seen with `TextEdit`.
- The purpose of steps 2-4 are to simulate an Arabic environment when the project is run, despite `OS.get_locale() == "en"` (or your system's current language).

### Minimal reproduction project

[rtlsymbols.zip](https://github.com/godotengine/godot/files/12525509/rtlsymbols.zip)
_insert_feature("subscript", HB_TAG('s', 'u', 'b', 's'), Variant::Type::BOOL, false);
	_insert_feature("superscript", HB_TAG('s', 'u', 'p', 's'), Variant::Type::BOOL, false);
	_insert_feature("swash", HB_TAG('s', 'w', 's', 'h'), Variant::Type::INT, false);
	_insert_feature("titling", HB_TAG('t', 'i', 't', 'l'), Variant::Type::BOOL, false);
	_insert_feature("trailing_jamo_forms", HB_TAG('t', 'j', 'm', 'o'), Variant::Type::INT, true);
	_insert_feature("traditional_name_forms", HB_TAG('t', 'n', 'a', 'm'), Variant::Type::INT, false);
	_insert_feature("tabular_figures", HB_TAG('t', 'n', 'u', 'm'), Variant::Type::BOOL, false);
	_insert_feature("traditional_forms", HB_TAG('t', 'r', 'a', 'd'), Variant::Type::INT, false);
	_insert_feature("third_widths", HB_TAG('t', 'w', 'i', 'd'), Variant::Type::BOOL, false);
	_insert_feature("unicase", HB_TAG('u', 'n', 'i', 'c'), Variant::Type::BOOL, false);
	_insert_feature("alternate_vertical_metrics", HB_TAG('v', 'a', 'l', 't'), Variant::Type::INT, false);
	_insert_feature("vattu_variants", HB_TAG('v', 'a', 't', 'u'), Variant::Type::INT, true);
	_insert_feature("vertical_contextual_half_width_spacing", HB_TAG('v', 'c', 'h', 'w'), Variant::Type::BOOL, false);
	_insert_feature("vertical_alternates", HB_TAG('v', 'e', 'r', 't'), Variant::Type::INT, false);
	_insert_feature("alternate_vertical_half_metrics", HB_TAG('v', 'h', 'a', 'l'), Variant::Type::BOOL, false);
	_insert_feature("vowel_jamo_forms", HB_TAG('v', 'j', 'm', 'o'), Variant::Type::INT, true);
	_insert_feature("vertical_kana_alternates", HB_TAG('v', 'k', 'n', 'a'), Variant::Type::INT, false);
	_insert_feature("vertical_kerning", HB_TAG('v', 'k', 'r', 'n'), Variant::Type::BOOL, false);
	_insert_feature("proportional_alternate_vertical_metrics", HB_TAG('v', 'p', 'a', 'l'), Variant::Type::BOOL, false);
	_insert_feature("vertical_alternates_and_rotation", HB_TAG('v', 'r', 't', '2'), Variant::Type::INT, false);
	_insert_feature("vertical_alternates_for_rotation", HB_TAG('v', 'r', 't', 'r'), Variant::Type::INT, false);
	_insert_feature("slashed_zero", HB_TAG('z', 'e', 'r', 'o'), Variant::Type::BOOL, false);
	
	_insert_feature("italic", HB_TAG('i', 't', 'a', 'l'), Variant::Type::INT, false);
	_insert_feature("optical_size", HB_TAG('o', 'p', 's', 'z'), Variant::Type::INT, false);
	_insert_feature("slant", HB_TAG('s', 'l', 'n', 't'), Variant::Type::INT, false);
	_insert_feature("width", HB_TAG('w', 'd', 't', 'h'), Variant::Type::INT, false);
	_insert_feature("weight", HB_TAG('w', 'g', 'h', 't'), Variant::Type::INT, false);
}
int64_t TextServerAdvanced::_name_to_tag(const String &p_name) const {