Unit name should allow "%" when I18N not enabled.

[davetcc]

Discussed in #447

^{Originally posted by AndyB117 February 11, 2024}
There is an error when you try to specify "Unit name" with character other than letter or digit.
Even if character is ASCII, for example "%". And it is not saved.
"%" as unit name is often used choice.
But if we change Unit name in generated code, all worked. We can use %, °, °C and so on.
How to bypass this limitation?
tcMenu v 4.2.1

[davetcc]

This is a bug introduced in V4.2.1

[davetcc]

A fix for this will be in 4.2.2, it fixes the problem where % could not be entered.