[bug-gettext] [bug #50920] support Javascript template strings in xgettext

[Bruno Haible]

Follow-up Comment #11, bug #50920 (project gettext):

> I think it is not straightforward to determine the end of template strings,
because substitutions may be nested

The grammar in
http://www.ecma-international.org/ecma-262/6.0/#sec-template-literal is pretty
straightforward. Yes, it looks like template strings can be nested, just like
expressions can be nested by using parentheses.

> Maybe, it could be based on the backtick support in the shell-script
scanner, which takes into account of nesting.

No, the backtick support in the shell-script scanner has additional
complexities because a backslash inside `...` in shell scripts is different
from a backslash outside `...`. Here, with the JavaScript template strings,
it's not that hairy.

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