70157 Update cupertino and material translations (a: internationalization, cla: yes, f: cupertino, f: material design)

70423 Add casts to widgets_test.dart to fix the engine roll. (a: internationalization, cla: yes, waiting for tree to go green)

70491 Remove some unnecessary casts, now that changes have rolled from the engine (a: internationalization, a: tests, cla: yes, framework, waiting for tree to go green)

70500 More lints (a: accessibility, a: internationalization, a: tests, cla: yes, f: cupertino, framework, team)

72944 [gen_l10n] Improve status message when untranslated messages are still present (a: internationalization, cla: yes, tool, waiting for tree to go green)