i18n: add swedish translation (#49)

Author: OyuDays

src/i18n/Engine.cpp

@@ -24,6 +24,12 @@ void I18n::initEngine() {
 
     // ru_RU (Russian)
     engine.registerEntry("ru_RU", TXT_KEY_SEARCH_SOMETHING, "Поиск...");
+  
+    // sv_SE (Swedish)
+    engine.registerEntry("sv_SE", TXT_KEY_SEARCH_SOMETHING, "Sök...");
+
+    // sv_FI (Finnish Swedish)
+    engine.registerEntry("sv_FI", TXT_KEY_SEARCH_SOMETHING, "Sök...");
 
     // zh (Simplified Chinese)
     engine.registerEntry("zh", TXT_KEY_SEARCH_SOMETHING, "搜索...");