Revert "Issue #2225681 by quietone, Jo Fitzgerald, dipakmdhrm, Adita, maxocub, Gábor Hojtsy, phenaproxima, iMiksu, Manuel Garcia, catch: Migrate D6 i18n blocks translated strings"

This reverts commit b53e50d7.

Issue #2225681 by quietone, Jo Fitzgerald, dipakmdhrm, Adita, maxocub, Gábor Hojtsy, phenaproxima, iMiksu, Manuel Garcia, catch: Migrate D6 i18n blocks translated strings

Issue #2422229 by quietone, ultimike, vprocessor, anish.a, Jo Fitzgerald, phenaproxima: D6->D8 Core block migrations missing settings tests

Issue #2513534 by tim.plunkett, lokapujya, tedbow, LewisNyman, Manjit.Singh, alexpott, Maninders, Bojhan: Remove the 'disabled' region from Block UI

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2281393 by ultimike, mrjmd, bdone, quietone, Xano, vendion, benjy, brockfanning, alexpott: D6->D8 Blocks - Custom titles not imported

Issue #2601682 by krknth, rakesh.gectcr, anil280988, jhodgdon: Unnecessary @param tags & Missing variable names in block, block_content module

Issue #2569703 by phenaproxima, benjy, webchick: When migrating to the same theme with different region names, block will not migrate properly

Issue #2408165 by phenaproxima, miguelc303, quietone, eliza411, tim.plunkett, bdone, benjy: Migration Files for Drupal 7  Blocks

Issue #2382985 by phenaproxima, quietone, -enzo-, benjy: Migration Files for Drupal 7 Menu & Menu Entries

Issue #2557253 by phenaproxima, neclimdul: MigrateFullDrupalTestBase test discovery gobbles all the memory

Issue #2550823 by phenaproxima, neclimdul: Migrate Drupal integration tests should load all dump files

Issue #2258177 by amateescu, sun, mikeryan, bdone, dawehner, Berdir: Convert migrate_drupal tests to KernelTestBase

Issue #2415399 by lokapujya, ultimike: D6->D8 migration: User role based block visibility settings not migrated properly

Issue #2030571 by calebtr, daffie, filijonka, YesCT, Thomas Brekelmans, alexpott, Mile23, tadityar, Sharique, tim.plunkett, boztek: Expand Block with methods

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

Issue #2358269 by Gábor Hojtsy: Migration bugs in block visibility, field overrides, cron, maintenance settings and form modes found by configuration schema checking

Issue #2339151 by EclipseGc, tim.plunkett, Gábor Hojtsy, effulgentsia: Conditions / context system does not allow for multiple configurable contexts, eg. language types

Issue #2321593 by Temoor: Replace all instances of block_load(), entity_load('block') and entity_load_multiple('block') with static method calls.

Issue #2314289 by benjy: Track result of migrations and use it to properly define migrate_dependencies.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2278541 by tim.plunkett, kim.pepper, Bojhan, EclipseGc: Refactor block visibility to use condition plugins.

Issue #1920862 by martin107, Mixologic, cilefen, larowlan, xan.ps, tim.plunkett | sun: Rename custom_block.module to block_content.module.