Change temp and fire to take from value not text for i18n

This change fixes the issue of the game using the text from the saved
fire and temperature states. Clean up of the game store should be done
before next release to just save fire and temperature values only in
`game.fire` and `game.temperature` respectively.

I disagree with how #156 tries to handle the issue as it would require fixing .po/.pot files.
As a collaborator myself, I have biased judgement towards these PRs so @Continuities
will have to do the deciding.