fixed #48, invalid nutrition symbols

[ekansemit]

closes #48

[3dde]

I will add this behavior to the English, Spanish and German translation tomorrow.

@ekansemit can you add this to the Chinese translation please?

[Th3JD]

Not completely related to fixing #48, but I changed the nutritions to exclude the vegetarian label if the meal is vegan, since this information is redundant. This clears up the symbols for vegan meals, since now only the plant is displayed. Had to change the filter in order not to remove vegan meals for vegetarian users.

[3dde]

I need to change the formatting of the tutorial additions, as they make the bot crash :/

[3dde]

PR should be ready for merging now :)