Handle cases where list of problems is empty
Fix bug when not using subset
Update pt translation
Fix axis language argument
Fix tests/README.md
Remove unnecessary block
Merge pull request #65 from r-gaia-cs/fix-tests

Fix tests/README.md
Merge pull request #63 from r-gaia-cs/fix-lang-option

Fix axis language argument
Merge pull request #62 from abelsiqueira/empty-subset

Treat cases where problem set is empty because of subset
Merge pull request #64 from r-gaia-cs/update-i18n

Update pt translation
Forgot string to update