### Godot version

4.0 stable

### System information

Fedora, RX 590

### Issue description

I made a dictionary, and instead of using `:` to separate between key and value, i accidentally used `=`.
The error message was not clear at all `Parse Error: Expected identifier or string as LUA-style dictionary key.` 

I don't think assuming that people know how dictionaries are made in LUA is reasonable. And if this is not about LUA the programming language, i don't even know what this is about :D

I think this error should be replaced with something of the sort "Please use `:` as separator instead of `=` in your dictionary"

### Steps to reproduce

Paste this code in a script:

```

var dict = {
	1 = "lala"
}
```

Observe the error message
![image](https://user-images.githubusercontent.com/7917475/224549538-38ea25aa-ba75-431e-868b-0733a53b90ad.png)


### Minimal reproduction project

see above
case BinaryOpNode::OP_MULTIPLICATION:
			push_text(" * ");
			break;
		case BinaryOpNode::OP_DIVISION:
			push_text(" / ");
			break;
		case BinaryOpNode::OP_MODULO:
			push_text(" % ");
			break;
		case BinaryOpNode::OP_POWER:
			push_text(" ** ");
			break;
		case BinaryOpNode::OP_BIT_LEFT_SHIFT:
			push_text(" << ");
			break;
		case BinaryOpNode::OP_BIT_RIGHT_SHIFT:
			push_text(" >> ");
			break;
		case BinaryOpNode::OP_BIT_AND:
			push_text(" & ");
			break;
		case BinaryOpNode::OP_BIT_OR:
			push_text(" | ");
			break;
		case BinaryOpNode::OP_BIT_XOR:
			push_text(" ^ ");
			break;
		case BinaryOpNode::OP_LOGIC_AND:
			push_text(" AND ");
			break;