[libcalamares] Move LocaleLabel from libcalamaresui to libcalamares

- This isn't a UI-dependent class
 - Doesn't make much sense in CalamaresUtilsGui either

src/libcalamares/utils/LocaleLabel.cpp

@@ -0,0 +1,73 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2017-2018, Adriaan de Groot <groot@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "LocaleLabel.h"
+
+namespace CalamaresUtils
+{
+
+LocaleLabel::LocaleLabel()
+    : m_locale( QLocale() )
+{
+    m_localeId = m_locale.name();
+    
+    setLabels( QString(), LabelFormat::IfNeededWithCountry );
+}
+
+LocaleLabel::LocaleLabel( const QString& locale, LabelFormat format )
+    : m_locale( LocaleLabel::getLocale( locale ) )
+    , m_localeId( locale )
+{
+    setLabels( locale, format );
+}
+
+void
+LocaleLabel::setLabels( const QString& locale, LabelFormat format )
+{
+    //: language[name] (country[name])
+    QString longFormat = QObject::tr( "%1 (%2)" );
+
+    QString languageName = m_locale.nativeLanguageName();
+    QString englishName = m_locale.languageToString( m_locale.language() );
+    QString countryName;
+
+    if ( languageName.isEmpty() )
+        languageName = QString( "* %1 (%2)" ).arg( locale, englishName );
+
+    bool needsCountryName = ( format == LabelFormat::AlwaysWithCountry ) ||
+        (locale.contains( '_' ) && QLocale::countriesForLanguage( m_locale.language() ).count() > 1 );
+
+    if ( needsCountryName )
+        countryName = m_locale.nativeCountryName();
+    m_label = needsCountryName ? longFormat.arg( languageName ).arg( countryName ) : languageName;
+    m_englishLabel = englishName;
+}
+
+QLocale LocaleLabel::getLocale( const QString& localeName )
+{
+    if ( localeName.contains( "@latin" ) )
+    {
+        QLocale loc( localeName );  // Ignores @latin
+        return QLocale( loc.language(), QLocale::Script::LatinScript, loc.country() );
+    }
+    else
+        return QLocale( localeName );
+}
+
+}  // namespace