[bug #61596] Support for Python f-strings

[Ben]

Follow-up Comment #3, bug #61596 (project gettext):

I am afraid I did not express myself well: xgettext should not accept
f-strings as arguments of _() or gettext(), but should recognise _() or
gettext(), or whatever is defined, inside f-strings.

So, in the last example:

    f'<label>{self._("Title")}:</label>'

xgettext should recognise "Title", because of _() inside the f-string.

So, what xgettext should do is evaluate anything inside braces {} within
f-strings as normal Python (which it is!) to see whether there are any
gettext() calls.

An f-string is any Python string (with ', ", ''' or """) prepended by an 'f'
or an 'F'.

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