Issue #2430981 by Cottser: Unnecessary notices when twig_render_template() catches \Twig_Error_Loader exceptions

Issue #2017471 by rodrigoaguilera, balagan, clemens.tolboom, Kristen Pol, Outi, rpayanm, danylevskyi, mon_franco, Antti J. Salminen, aloyr, thlafon, Marc Hannaford, kreatIL, oussema, David Hernández: Multilingual tour for language section

Issue #2431477 by martin107: make TermUnitTest a KernelTestBase by moving createTerm and createVocabulary to a trait

Issue #2382561 by Sabreena, DickJohnson, aliyakhan, Tom Verhaeghe, emma.maria: In narrow viewports (<320px), the toolbar menu tray should be 100% width

Issue #2407725 by mortendk, sivaji@knackforge.com, rteijeiro, Manjit.Singh: Remove classes from system templates d*.html.twig

Issue #2369981 by Cottser: Not found templates are displayed literally instead of throwing an Exception due to string loader

Issue #2428087 by jhodgdon, foxtrotcharlie: Boolean field formatter - default choice appears in list twice

Issue #2227227 by mpdonadio, amateescu, yched, larowlan, swentel, tstoeckler, fago: FieldTypePluginManager cannot instantiate FieldType plugins, good thing TypedDataManager can instantiate just about anything

Issue #2395901 by chx, dawehner, tstoeckler: Allow the same test-specific overrides in KernelTestBase as in WebTestBase

Issue #2206485 by pjonckiere, sandipmkhairnar: StylePluginBase::getFieldValue shouldn't be protected

Issue #1600670 by mradcliffe, bendiy, bzrudi71, andypost, daffie, stefan.r, devpreview: Cannot query Postgres database that has column names with capital letters

Issue #2437785 by amateescu: FieldConfigStorageBase::mapToStorageRecord() calls the wrong field type method

Issue #2435493 by effulgentsia: Change String::format()'s '@' and '%' placeholders to be auto-escaped rather than always-escaped

Issue #2442255 by swentel, larowlan, rteijeiro, Wim Leers: Changing text formats on a field makes it impossible to edit

Issue #2425581 by greg.1.anderson: !message in t() can lead to double-escaping when used in drupal_set_message()