[libcalamares] Add get() to the string

- Look up the translation of the requested string with the current
   or a specific locale. This implementation is a stub.
 - Add tests for the getter.

src/libcalamares/locale/Tests.cpp

@@ -109,10 +109,16 @@ void LocaleTests::testTranslatableConfig1()
     CalamaresUtils::Locale::TranslatedString ts1( "Hello" );
     QCOMPARE( ts1.count(), 1 );
     
+    QCOMPARE( ts1.get(), "Hello" );
+    QCOMPARE( ts1.get( QLocale("nl")), "Hello" );
+    
     QVariantMap map;
     map.insert( "description", "description (no language)" );
     CalamaresUtils::Locale::TranslatedString ts2(map, "description");
     QCOMPARE( ts2.count(), 1 );
+    
+    QCOMPARE( ts2.get(), "description (no language)");
+    QCOMPARE( ts2.get( QLocale( "nl" ) ), "description (no language)");
 }
 
 void LocaleTests::testTranslatableConfig2()
@@ -131,6 +137,9 @@ void LocaleTests::testTranslatableConfig2()
     CalamaresUtils::Locale::TranslatedString ts1(map, "description");
     // The +1 is because "" is always also inserted
     QCOMPARE( ts1.count(), someLanguages().count()+1 );
+
+    QCOMPARE( ts1.get(), "description");  // it wasn't set
+    QCOMPARE( ts1.get( QLocale( "nl" ) ), "description (language nl)");
     
     CalamaresUtils::Locale::TranslatedString ts2(map, "name");
     // We skipped dutch this time

src/libcalamares/locale/TranslatableConfiguration.cpp

@@ -53,7 +53,6 @@ TranslatedString::TranslatedString(const QVariantMap& map, const QString& key)
         }
         else if ( subkey.startsWith( key ) )
         {
-            cDebug() << "Checking" << subkey;
             QRegularExpressionMatch match;
             if ( subkey.indexOf( QRegularExpression("\\[([a-zA-Z_@]*)\\]"), 0, &match ) > 0 )
             {
@@ -64,5 +63,17 @@ TranslatedString::TranslatedString(const QVariantMap& map, const QString& key)
     }
 }
 
+QString TranslatedString::get() const
+{
+    return get( QLocale() );
+}
+
+QString TranslatedString::get(const QLocale& locale) const
+{
+    cDebug() << "Getting locale" << locale.name();
+    return m_strings[QString()];
+}
+
+
 }  // namespace Locale
 }  // namespace CalamaresUtils

src/libcalamares/locale/TranslatableConfiguration.h

@@ -47,6 +47,12 @@ namespace Locale
         
         int count() const { return m_strings.count(); }
         
+        /// @brief Gets the string in the current locale
+        QString get() const;
+        
+        /// @brief Gets the string from the given locale
+        QString get(const QLocale&) const;
+        
     private:
         // Maps locale name to human-readable string, "" is English
         QMap< QString, QString > m_strings;