use correct iso code 'cs_CZ' for czech instead of country code 'cz'

Author: Peter

core/src/main/java/com/graphhopper/util/TranslationMap.java

@@ -30,7 +30,7 @@
 public class TranslationMap
 {
     // ISO codes (639-1), use 'en_US' as reference
-    private static final List<String> LOCALES = Arrays.asList("ar", "bg", "ca", "cz", "de_DE", "el",
+    private static final List<String> LOCALES = Arrays.asList("ar", "bg", "ca", "cs_CZ", "de_DE", "el",
             "en_US", "es", "fa", "fil", "fi", "fr", "gl", "he", "hsb", "hu_HU", "it", "ja",
             "lt_LT", "ne", "nl", "pl_PL", "pt_BR", "pt_PT", "ro", "ru", "si", "sk",
             "sv_SE", "tr", "uk", "vi_VI", "zh_CN");

web/src/main/java/com/graphhopper/http/I18NServlet.java

@@ -28,8 +28,6 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-import static javax.servlet.http.HttpServletResponse.*;
-
 import org.json.JSONObject;
 
 /**