Issue #1588422 by andypost, disasm, sun, dawehner, vasi1186, alexpott, tim.plunkett, larowlan, Gábor Hojtsy: Convert contact categories to configuration system.
Issue #1739994 by pp, das-peter, Gábor Hojtsy: Use the Language class universally instead of stdObj instances.
Issue #1280996 by tarmstrong, vasi1186, fastangel, dawehner, tobiasb: New language_select() element type for form API.
