fix can't change report language in new renderjs ui

In web site, the default language priority is 80 which is higher than 10 when target language is choose

According to

1. Browser is supposed to send something between 0 and 1

2. Localizer will set 2 or 3 for cases where user selected language

3. all print scripts seems set selected language priority to 10: ProductionOrder_printAsODT, ProductionPackingList_printAsODT ....

so here we introduce a convention to fix report language issue

1. site language priority should be 8(>3 and < 10)
2. print script should set selected language priority to 10