consider the environment variable VIS_SPELLLANG as default

If the variable VIS_SPELLLANG is not set the variable LANG is considered
next.

Passing the spellchecking language via the environment can be useful
when starting vis from different contexts.
My use case is different mail addresses in mutt.
On one address I mostly communicate in English and on another I
communicate in German. Passing the context specific language vis the
environment safes setting the spellchecking language for each email I
write.

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