### Tested versions

See "System information" below.

### System information

Godot v4.1.4.rc (2d3b2abcf) - Windows 10.0.19045 - Vulkan (Compatibility) - NVIDIA GeForce GTX 970 (NVIDIA; 31.0.15.2698) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

POT generation ignores tr() expression in dictionaries:
```python
var strDeclarer = { 'N':tr("North"), 'E':tr("East"), 'S':tr("South"), 'W':tr("West") }[declarer]
var strVulnerable = { 0:tr("none"), 1:tr("both"), 2:tr("NS"), 3:tr("EW") }[vulnerable]
```
Strings as tr() parameters do not show up in the POT file.

### Steps to reproduce

FYI: [Creating the PO template - Automatic generation using the editor](https://docs.godotengine.org/en/stable/tutorials/i18n/localization_using_gettext.html#automatic-generation-using-the-editor)

### Minimal reproduction project (MRP)

N/A
GDCLASS(GDScriptEditorTranslationParserPlugin, EditorTranslationParserPlugin);
	Vector<String> *ids = nullptr;
	Vector<Vector<String>> *ids_ctx_plural = nullptr;
	
	StringName tr_func = "tr";
	StringName trn_func = "tr_n";
	HashSet<StringName> assignment_patterns;
	HashSet<StringName> first_arg_patterns;
	HashSet<StringName> second_arg_patterns;
	
	StringName fd_add_filter = "add_filter";
	StringName fd_set_filter = "set_filters";
	StringName fd_filters = "filters";
	static bool _is_constant_string(const GDScriptParser::ExpressionNode *p_expression);
	void _traverse_class(const GDScriptParser::ClassNode *p_class);
	void _traverse_function(const GDScriptParser::FunctionNode *p_func);
	void _traverse_block(const GDScriptParser::SuiteNode *p_suite);
	void _read_variable(const GDScriptParser::VariableNode *p_var);
	void _assess_expression(const GDScriptParser::ExpressionNode *p_expression);
	void _assess_assignment(const GDScriptParser::AssignmentNode *p_assignment);
	void _extract_from_call(const GDScriptParser::CallNode *p_call);
	void _extract_fd_constant_strings(const GDScriptParser::ExpressionNode *p_expression);
public:
	virtual Error parse_file(const String &p_path, Vector<String> *r_ids, Vector<Vector<String>> *r_ids_ctx_plural) override;
	virtual void get_recognized_extensions(List<String> *r_extensions) const override;
	GDScriptEditorTranslationParserPlugin();
};
#endif