No Effect

Thanks for pointing out the problem.

When a user try add a beanstag with language prefix path alias, it fails to pass the validation. the attached patch should fixed the problem.

Here is an example on how beanstag works in multi-lingual.

Assume you have the following 4 nodes.

Name: Article A
Internal path: node/1
Path alias: articles/article-a
Language: ENG (default site language so no path prefix above)

Name: Article B
Internal path: node/2
Path alias: articles/article-b
Language: ENG (default site language so no path prefix above)

Name: Article A
Internal path: fr/node/3
Path alias: fr/articles/article-a
Language: FRENCH

Name: Article B
Internal path: fr/node/4
Path alias: fr/articles/article-b
Language: FRENCH

you could add beanstags for the following path alias.
articles/article-a
articles/article-b
fr/articles/article-a
fr/articles/article-b

If you want beanstag to work on internal paths, you need to add the the follow as well
node/1
node/2
fr/node/3
fr/node/4

patch applied to 7.x-1.2.