Merge branch 'ab/i18n-fixup' into maint

* ab/i18n-fixup: (24 commits) i18n: use test_i18n{cmp,grep} in t7600, t7607, t7611 and t7811 i18n: use test_i18n{grep,cmp} in t7508 i18n: use test_i18ngrep in t7506 i18n: use test_i18ngrep and test_i18ncmp in t7502 i18n: use test_i18ngrep in t7501 i18n: use test_i18ncmp in t7500 i18n: use test_i18ngrep in t7201 i18n: use test_i18ncmp and test_i18ngrep in t7102 and t7110 i18n: use test_i18ncmp and test_i18ngrep in t5541, t6040, t6120, t7004, t7012 and t7060 i18n: use test_i18ncmp and test_i18ngrep in t3700, t4001 and t4014 i18n: use test_i18ncmp and test_i18ngrep in t3203, t3501 and t3507 i18n: use test_i18ngrep in t2020, t2204, t3030, and t3200 i18n: use test_i18ngrep in lib-httpd and t2019 i18n: do not overuse C_LOCALE_OUTPUT (grep) i18n: use test_i18ncmp in t1200 and t2200 i18n: .git file is not a human readable message (t5601) i18n: do not overuse C_LOCALE_OUTPUT i18n: mark init-db messages for translation i18n: mark checkout plural warning for translation i18n: mark checkout --detach messages for translation ...