Define BRL_BLK_ commands for directly updating the preferences menu file selectors: (dm)

SET_TTB -> Text Table
SET_ATB -> Attributes Table
SET_CTB -> Contraction Table
SET_KTB -> Keyboard Table
SET_LPF -> Language Profile
Use full words (rather than short forms) for the new table selection commands: (dm)

SET_TTB -> SET_TEXT_TABLE
SET_ATB -> SET_ATTRIBUTES_TABLE
SET_CTB -> SET_CONTRACTION_TABLE
SET_kTB -> SET_KEYBOARD_TABLE
SET_LPF -> SET_LANGUAGE_PROFILE