Fabian Homborg 72a44460c6 Move fish_greeting to a function
This adds a "fish_greeting" function that prints the variable of the
same name.

In doing so, it makes $fish_greeting default to a global
variable (this is of little cost because of the `_` builtin)

This means that:

- We have fewer universal variables by default
- If we change the default greeting people will actually get
- it (unless they have a leftover universal, of course)
- If the user changes their language the variable changes with it
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