Cherry-pick license change and a bugfix to release/8.0

Fix licensing banners
Fix indentation
Fix crash deleting category with new affix template (LT-13932)
Remove double space
Remove accidental diacritic from comment
Improve copyright banner spacing
Change license templates and update copyright
Misc. copyright updates but not to license
Change license and copyright banners in code files
Revert license notice change in PhraseTranslationHelper
Correct license change to LGPL
Change license from LGPL to MIT in docs and About

Change-Id: I0e4c6c732bb45e0ed1e88bd08e8e4f5dc901e307
(cherry picked from commit 82a20212f28542d9d2b85a41e4a16c4d00876ba1)
(cherry picked from commit 668365e2f2866f9afba829bd1d3a297559fb0a8a)
(cherry picked from commit a33087be293b5b60809c04da7e166c2196b34890)
(cherry picked from commit 68ff26c53ebfe632dfb84bedf9c46494a7754e63)
(cherry picked from commit 29770bee6d471a4149f7258e2933d39652e78b5f)
(cherry picked from commit f1bdd62f842bd6f86a34f524a542b94c1bec9171)
(cherry picked from commit f698da826f1bd41b316779d316304a37eb191551)
(cherry picked from commit c6384995569ebd5bd0375a64db8acde3bd762d4e)
(cherry picked from commit 920bb99c169b8be74db885e25a8907ce8a3cc0c6)
(cherry picked from commit 0a37fb149ffc2d9d0dfd9c47eaac5cf504f56d6d)
(cherry picked from commit 406259e82ad64bbcf60ef7a9377033a176fb3191)
(cherry picked from commit 9b31d45f6fcc1b846cd0984ebda42dae2d3ec77a)