Issue #2587685 by Antti J. Salminen, lauriii, jaakko, AjitS, Sagar Ramgade, rang501: Remove references to non existing preprocess functions

Issue #2471739 by RajeevK, martins.kajins, pektinasen, LewisNyman, jaxxed: Convert reusable layout classes to BEM standards

Revert "Issue #2471739 by RajeevK, martins.kajins, LewisNyman, jaxxed: Convert reusable layout classes to BEM standards"

This reverts commit cec8f5eb.

Issue #2471739 by RajeevK, martins.kajins, LewisNyman, jaxxed: Convert reusable layout classes to BEM standards

Issue #2485397 by Manjit.Singh, MathieuSpil, gajendra sharma, saki007ster, LewisNyman: Clean up config translation CSS inline with our CSS standards

Issue #1952394 by vijaycs85, tstoeckler, webflo, Gábor Hojtsy, Schnitzel, falcon03, YesCT, kfritsche, Ryan Weal, dagmita, likin, toddtomlinson, nonsie, Kristen Pol, dawehner, tim.plunkett, penyaskito, EclipseGC, larowlan, robertdbailey, helenkim, David Hernández, EllaTheHarpy, lazysoundsystem, juanolalla, R.Hendel, Kartagis: Add configuration translation user interface module.