Issues are intended for bug report and feature requests. For any bug report please make sure to include the complete stack trace and DEBUG level logs as well as reproduce steps.
If you use the CLI, you can create a debug log file with subliminal --debug [...] 2> debug.log.
You can contribute code and documentation with pull requests. Any code contribution must be unit tested and the pull request open against the develop branch.
Contribution to translations can be made on subliminal's transifex page Subliminal is configured to work with transifex-client