Fix language used in pdf attachement sent by mail

[Matt75]

Questions	Answers
Branch?	develop
Description?	Invoice or DeliverySlip sent by mail are not using Language used for Order
Type?	bug fix
Category?	CO
BC breaks?	no
Deprecations?	no
Fixed ticket?	#10258 (Partial : fixed only for PDF sent by mail)
How to test?	Change OrderState to Payment accepted or change OrderState to Processing in progress, attachment PDF sent by mail use Language used in BO, not Language used in Order.

Test scenario

In FO use French language
Make an Order in french

In BO use English language
Change OrderState to Payment accepted
Mail sent to Customer have attachment in English (BO language) instead of Customer language used to make the Order.

With this change, mail attachement should be in language used by customer on FO

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This change is 

[khouloudbelguith]

Hi @Matt75,

I installed a shop with the "English" language and Japan country.
In the Fo, the customer language is (Japanese)

• The invoice and delivery slip sent by email are in (Japanese). => OK
  
  

• In the BO => Orders page => pdf files downloaded NOK as reported here: [BOOM-4250] Some characters (Cyrillic, Persian...) in invoice pdf show as undefined characters #9817

Thanks!

[Progi1984]

Thanks @Matt75

[superskyman100]

This code works only with your configuration. We tried with PS 1.7.6.4 it's not working, the files are different.

[Matt75]

@superskyman100 This change is only for 1.7.8 ;)