### 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)
if (hb_ot_layout_feature_get_name_ids(hb_face, HB_OT_TAG_GPOS, i, &lbl_id, nullptr, nullptr, nullptr, nullptr)) {
						PackedInt32Array lbl;
						unsigned int text_size = hb_ot_name_get_utf32(hb_face, lbl_id, hb_language_from_string(TranslationServer::get_singleton()->get_tool_locale().ascii().get_data(), -1), nullptr, nullptr) + 1;
						lbl.resize(text_size);
						memset((uint32_t *)lbl.ptrw(), 0, sizeof(uint32_t) * text_size);
						hb_ot_name_get_utf32(hb_face, lbl_id, hb_language_from_string(TranslationServer::get_singleton()->get_tool_locale().ascii().get_data(), -1), &text_size, (uint32_t *)lbl.ptrw());
						ftr["label"] = String((const char32_t *)lbl.ptr());
					}
#else
#ifndef _MSC_VER
#warning Building with HarfBuzz < 2.1.0, readable OpenType feature names disabled.
#endif
#endif
					ftr["type"] = _get_tag_type(feature_tags[i]);
					ftr["hidden"] = _get_tag_hidden(feature_tags[i]);
					p_font_data->supported_features[feature_tags[i]] = ftr;
				}
				memfree(feature_tags);
			}
			
			p_font_data->supported_varaitions.clear();
			if (fd->face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) {
				FT_MM_Var *amaster;
				FT_Get_MM_Var(fd->face, &amaster);
				for (FT_UInt i = 0; i < amaster->num_axis; i++) {
					p_font_data->supported_varaitions[(int32_t)amaster->axis[i].tag] = Vector3i(amaster->axis[i].minimum / 65536, amaster->axis[i].maximum / 65536, amaster->axis[i].def / 65536);
				}
				FT_Done_MM_Var(ft_library, amaster);
			}
			p_font_data->face_init = true;