Alias soft_drink -> soda

BUR #7174 has been approved by @evazion.

create alias soft_drink -> soda

Appears to be the same thing, but soda is more populated than soft drink. Also causes a lot of confusion since the beverage is given different names depending on culture and region (fizzy drink, soda pop, soda, pop, soft drink, tonic, "coke", etc.).

Technically lemonade, juice and other non-alcoholic non-carbonated drinks you might find in a fountain machine or vending machine are also "soft_drinks", but not soda. They have better more specific tags though, so I'm not sure it matters that much.

The bulk update request #7174 (forum #196505) has been approved by @evazion.