i18n: add greek translation (#57)

Author: athinaslime

src/i18n/Engine.cpp

@@ -16,6 +16,9 @@ void I18n::initEngine() {
     // de_DE (German)
     engine.registerEntry("de_DE", TXT_KEY_SEARCH_SOMETHING, "Suche...");
 
+    // el_GR (Greek)
+    engine.registerEntry("el_GR", TXT_KEY_SEARCH_SOMETHING, "Αναζήτηστε...");
+    
     // en_US (English)
     engine.registerEntry("en_US", TXT_KEY_SEARCH_SOMETHING, "Search...");