Issue #3391786 by quietone, xjm, smustgrave: Fix spelling of words only misspelled in tests, variable names, part 5

Issue #3278415 by nod_, lauriii, catch, Wim Leers, longwave, xjm, claudiu.cristea: Remove usages of the JavaScript ES6 build step, the build step itself, and associated dev dependencies

Issue #3239123 by hooroomoo, bnjmnm, nod_: Refactor (if feasible) uses of the jQuery text function to use vanillaJS

Issue #3253148 by mherchel, longwave, ckrina, droplet: Remove IE from core's browserlist, remove non-essential CSS importing and recompile assets

Issue #3101543 by lauriii, bnjmnm, ravi.shankar, alexpott: Update core JavaScript dependencies listed in package.json

Revert "Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json"

This reverts commit 2dadb738.

Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json

Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

Issue #2473945 by Cottser, rachel_norfolk, axe312, davidhernandez, yannickoo, emma.maria, cilefen, akalata, jaxxed, LewisNyman: Prefix form-item classes with js-

Issue #1982230 by andythomnz, holist, cilefen, herom, BarisW: Modernize markup for the locale module

Issue #2318381 by csakiistvan, thamas: Fixed Message not styled properly on interface translation page .

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #1804702 by Sutharsan, balintk, YesCT, Jose Reyero, Gábor Hojtsy: Display interface translation status.

Issue #1452188 by Schnitzel, droplet, Sutharsan, Bojhan, Kristen Pol, Gábor Hojtsy, ershov.andrey, perusio, nod_, rvilar, andypost: Added New UI for string translation.