Accepting different word forms as correct answers

[Bios-Marcel]

Currently the word lists contain all kinds of words, however, many users for example try the verb instead of the noun and are lead to believe their guess is wrong, even though it's practically correct. What we'd have to do here is introduce a second word format, such as:

walk,walking
cook,cooking
...

However, I wouldn't do this for all wordlists, since I don't speak all languages ;)

On top of that, the feature will be optional and enabled by default. It shouldn't be toggleableb mid-game.

Obviously this means deduplicating the wordlist for now, as we don't want thing such as these:

cook,cooking
cooking,cook

Additionally this could take word forms into consideration.

For example the american color is colour in british english.