Import translation memory fails if string contains \n

[htgoebel]

When trying to import a translation memory this fails with the following error message:

Failed to parse JSON file: 'Error reading config file {filename!r}:\n{error_msg}' does not match '^(.+)$'
Failed validating 'pattern' in schema['items']['properties']['source']: {'$id': '#/items/properties/source', 'default': '', 'examples': ['Hello'], 'pattern': '^(.+)$', 'title': 'The Source String', 'type': 'string'} 
On instance[79]['source']: 'Error reading config file {filename!r}:\n{error_msg}' 

As you can see, the string contains \n.

Additional information

• When replacing the \n by a space, it fails with the next string containing a \n (which of course is the translated string).
• This looks like pattern matching is missing option re.DOTALL.
• Maybe it makes sense to change the pattern in the schema empty '' (empty string)

To Reproduce the bug

Steps to reproduce the behavior:

0. Save attached file bug.json as /tmp/bug.json
1. Go to '$PROJECT -> Manamge -> Translation memory'
2. Scroll down to 'Import translation memory'
3. Upload saved file (/tmp/bug.json)
4. See error

Expected behavior

Importing translation memoires containing such strings passes and line-feed is preserved.

Server configuration and status

Weblate installation: self-hosted from PyPI

Weblate 4.3.2
weblate-language-data 2020.11

(Sorry, I don't have console access, So I can't run ./manage.py list_versions)

Weblate deploy checks

(Sorry, I don't have console access, So I can't run this command)

[github-actions]

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