Redirect target to static route can't use the route name

Hello, i noticed in that the feedback redirect target parameter we can add only a url or an path.
Though if we have a multilingual website it is problematic.

for example on the config: boltforms.bolt.yml

```
...

feedback:
success: form.pionners.success_msg
error: form.pionners.error_msg
redirect:
target: /mypath # A page path, or URL
query: [ email, code ] # Optional keys for the GET parameters
```

for a my rooting config:

```

myroute:
path: /mypath
defaults:
_controller: controller.frontend:template
template: mytemplate
```

thought: /mypath with not work.

because i have actually these urls:
* /fr/mypath
* /en/mypath

this will work:

```
feedback:
success: form.pionners.success_msg
error: form.pionners.error_msg
redirect:
target: /fr/mypath # A page path, or URL
query: [ email, code ] # Optional keys for the GET parameters
```

it is impossible to add the route name.
this will not work:

```
target: myroute
```

because the RedirectableUrlMatcher is used into these files:

extensions/vendor/bolt/boltforms/src/Submission/Handler/Redirect.php
on the function: getRedirectResponse

does anyone have a way to make it work?

otherwise, what do you think it could be the best way to make it work?