File extension not validated when uploading translation file via web

When we update translation for any project version , it allows us to upload any type of file and it gives unexcepted error after upload, it should be handled correctly while uploding

Steps to Reproduce:

• Login to zanata.

• Go to dashboard.

• Select project - > version

• Select language and if there is already document there

• click on down arrow to update the translation

• Select any file

• observe the behavior

Actual Result:

• Unexpected error while update translation file

Expected Result:

• file validation should be handed while update translation

Note:

• Attached screen captured for more info