Correct media upload error + add file name

[spacegaier]

Breaking change

Proposed change

Two changes:

1. Previously the media upload error said "image", which of course is not always correct (I tried to upload audio WAV files). Now we use generically "file".
2. Since you can upload multiple files at once (at least for media), it is helpful to know which file actually caused the error. Therefore I added the filename in brackets.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io