Select files button text should respect field cardinality

Committed, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.

if max_files (aka DropZone MaxFiles) is not set, the plural label should be used, because there is no limitation on number of files then. Now this is getting singular label, because cardinality is set to 0 by default and 0 is interpreted as singular.

I suppose $cardinality should be -1 instead by default, which will bring up plural label, see https://git.drupalcode.org/project/dropzonejs/-/blob/f3ac85c8d535452bd89...