Related: tdf#147390 Accept oc-FR-lengadoc and oc-ES-aranes for oc-FR and oc-ES

... as aliases for forward compatibility with the change in LO 7.4

Change-Id: I13848f982a0c76abd8e2186d81bbfc9770c89a7d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135473
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
diff --git a/i18nlangtag/qa/cppunit/test_languagetag.cxx b/i18nlangtag/qa/cppunit/test_languagetag.cxx
index 84e363d..7b875c5 100644
--- a/i18nlangtag/qa/cppunit/test_languagetag.cxx
+++ b/i18nlangtag/qa/cppunit/test_languagetag.cxx
@@ -749,6 +749,8 @@ bool checkMapping( std::u16string_view rStr1, std::u16string_view rStr2 )
    if (rStr1 == u"cmn-CN"      ) return rStr2 == u"zh-CN";
    if (rStr1 == u"cmn-TW"      ) return rStr2 == u"zh-TW";
    if (rStr1 == u"kw-UK"       ) return rStr2 == u"kw-GB";
    if (rStr1 == u"oc-FR-lengadoc" ) return rStr2 == u"oc-FR";
    if (rStr1 == u"oc-ES-aranes" ) return rStr2 == u"oc-ES";
    return rStr1 == rStr2;
}

diff --git a/i18nlangtag/source/isolang/isolang.cxx b/i18nlangtag/source/isolang/isolang.cxx
index 5d0a23c..2a7a467 100644
--- a/i18nlangtag/source/isolang/isolang.cxx
+++ b/i18nlangtag/source/isolang/isolang.cxx
@@ -778,6 +778,8 @@ Bcp47CountryEntry const aImplBcp47CountryEntries[] =
    { LANGUAGE_USER_ENGLISH_UK_OED,           "en-GB-oed", "GB", "", LANGUAGE_USER_ENGLISH_UK_OXENDICT },   // grandfathered, deprecated, prefer en-GB-oxendict
    { LANGUAGE_SPANISH_DATED,           "es-ES-u-co-trad", "ES", "es-u-co-trad", k0 },  // RFC6067/CLDR
    { LANGUAGE_SPANISH_DATED,              "es-ES_tradnl", "ES", "", kSAME },           // MS malformed
    { LANGUAGE_OCCITAN_FRANCE,           "oc-FR-lengadoc", "FR", "oc-lengadoc", kSAME },  // forward compatibility
    { LANGUAGE_USER_OCCITAN_ARANESE,       "oc-ES-aranes", "ES", "oc-aranes", kSAME },  // forward compatibility
//  { LANGUAGE_YUE_CHINESE_HONGKONG,         "zh-yue-HK", "HK", "", 0 },   // MS reserved, prefer yue-HK; do not add unless LanguageTag::simpleExtract() can handle it to not call liblangtag for rsc!
    { LANGUAGE_YIDDISH,                          "yi-001",   "", "", k0 },  // MS since rev.15, was "yi-Hebr" reserved, "001"="World"
    { LANGUAGE_FRENCH_WEST_INDIES,               "fr-029",   "", "", k0 },  // MS since rev.15, was "Neither defined nor reserved", "029"="Caribbean"