Issue #2421391 by mortendk, LewisNyman, rteijeiro: taxonomy.modules.css should be taxonomy.theme.css

Issue #2225431 by mr.baileys, Wim Leers, swentel: Apply formatters and widgets to Taxonomy Term base fields.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.