Fix push notification bug

[david-venhoff]

Short description

This pr fixes a problem that the best_translation method of push notifications prefers translations without title over translations with title.

Proposed changes

• Only return the backend translation if it has a title

Side effects

Resolved issues

Fixes: #2726

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Pull Request Review Guidelines

[codeclimate[bot]]

Code Climate has analyzed commit 8e5270a4 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 81.8% (0.0% change).

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[david-venhoff]

@JoeyStk I have added a test for this bug

[david-venhoff]

Thanks :)