Resolves: tdf#83376 do not let linguistic tools fall back to known languages

Falling back to known locales was necessary before the new language tag
implementation that can register "unknown" tags on the fly. In fact here we
want to handle tags unknown to us and not fall back to worst case en-US even,
so that dictionaries, grammar checkers, thesauri et al for any language tag can
be used with such tagged document content.

Change-Id: I06e54f41e00e69779b4c0cbbc891f250545a17d2

linguistic/source/lngsvcmgr.cxx

@@ -839,7 +839,7 @@ void LngSvcMgr::Notify( const uno::Sequence< OUString > &rPropertyNames )
 
                 LanguageType nLang = LANGUAGE_NONE;
                 if (!aKeyText.isEmpty())
-                    nLang = LanguageTag::convertToLanguageTypeWithFallback( aKeyText );
+                    nLang = LanguageTag::convertToLanguageType( aKeyText );
 
                 GetSpellCheckerDsp_Impl( false );     // don't set service list, it will be done below
                 pSpellDsp->SetServiceList( LanguageTag::convertToLocale(nLang), aSvcImplNames );
@@ -862,7 +862,7 @@ void LngSvcMgr::Notify( const uno::Sequence< OUString > &rPropertyNames )
 
                 LanguageType nLang = LANGUAGE_NONE;
                 if (!aKeyText.isEmpty())
-                    nLang = LanguageTag::convertToLanguageTypeWithFallback( aKeyText );
+                    nLang = LanguageTag::convertToLanguageType( aKeyText );
 
                 if (SvtLinguConfig().HasGrammarChecker())
                 {
@@ -888,7 +888,7 @@ void LngSvcMgr::Notify( const uno::Sequence< OUString > &rPropertyNames )
 
                 LanguageType nLang = LANGUAGE_NONE;
                 if (!aKeyText.isEmpty())
-                    nLang = LanguageTag::convertToLanguageTypeWithFallback( aKeyText );
+                    nLang = LanguageTag::convertToLanguageType( aKeyText );
 
                 GetHyphenatorDsp_Impl( false );   // don't set service list, it will be done below
                 pHyphDsp->SetServiceList( LanguageTag::convertToLocale(nLang), aSvcImplNames );
@@ -911,7 +911,7 @@ void LngSvcMgr::Notify( const uno::Sequence< OUString > &rPropertyNames )
 
                 LanguageType nLang = LANGUAGE_NONE;
                 if (!aKeyText.isEmpty())
-                    nLang = LanguageTag::convertToLanguageTypeWithFallback( aKeyText );
+                    nLang = LanguageTag::convertToLanguageType( aKeyText );
 
                 GetThesaurusDsp_Impl( false );  // don't set service list, it will be done below
                 pThesDsp->SetServiceList( LanguageTag::convertToLocale(nLang), aSvcImplNames );