Add date filtering in sales overview

Add jquery-ui datepicker
Format dates in sale and receiving forms according to configured
dateformat and timeformat settings
Add missing translations in sale (click delete when not selecting
anything)
Add search box back to search for customer sales and ticket numbers

application/language/ru/sales_lang.php

@@ -67,7 +67,7 @@ $lang["sales_no_filter"] = "All";
 $lang["sales_no_items_in_cart"] = "Там нет товаров в корзине";
 $lang["sales_no_sales_to_display"] = "No sales to display";
 $lang["sales_one_or_multiple"] = "";
-$lang["sales_overview"] = "Overview";
+$lang["sales_takings"] = "Takings";
 $lang["sales_payment"] = "Вид оплаты";
 $lang["sales_payment_amount"] = "количество";
 $lang["sales_payment_not_cover_total"] = "оплачиваемая сумма недостаточно";
@@ -111,3 +111,4 @@ $lang["sales_unsuccessfully_updated"] = "Продажа безуспешно о
 $lang["sales_unsuspend"] = "Разблокировать";
 $lang["sales_unsuspend_and_delete"] = "Разблокировать и удалить";
 $lang["sales_update"] = "Edit Sale";
+$lang["sales_date_range"] = "размах числа";