i18n: add Turkish translation (#73)

Author: acardeniz

src/i18n/Engine.cpp

@@ -94,7 +94,10 @@ void I18n::initEngine() {
     // ta_IN (Tamil)
     engine.registerEntry("ta_IN", TXT_KEY_SEARCH_SOMETHING, "தேடவும்...");
 
-    // vi_VN (Vietnamese)
+    // tr_TR (Turkish)
+    engine.registerEntry("tr_TR", TXT_KEY_SEARCH_SOMETHING, "Ara...");
+    
+     // vi_VN (Vietnamese)
     engine.registerEntry("vi_VN", TXT_KEY_SEARCH_SOMETHING, "Tìm kiếm...");
 
     // zh (Simplified Chinese)