Allocate custom language environment variables statically, because environment is accessed by shared library exit routines, after the interpreter memory allocations have been freed.

[INTERPRETER]
* BUG: Allocate custom language environment variables statically, because environment is accessed by shared library exit routines, after the interpreter memory allocations have been freed.

Define a new limit constant, that is the maximum length of the System.Language variable. It is 16 bytes.

[INTERPRETER]
* NEW: Define a new limit constant, that is the maximum length of the System.Language variable. It is 16 bytes.