Add RTL version of sample images

[mparvazi]

Questions	Answers
Description?	Add RTL version of sample images and improve image upload.
Type?	improvement
BC breaks?	no
Deprecations?	no
Fixed ticket?	Fixes PrestaShop/PrestaShop#27423 & PrestaShop/PrestaShop#27777
How to test?	-

[mparvazi]

@PierreRambaud @NeOMakinG

Redo for #67

[Progi1984]

Some feedbacks :)

[mparvazi]

@Progi1984

I changed the condition for upload image, so user can upload image just for one language without error.
It's useful when user wants to update an image just for a language.
But when user want to create slide, if user doesn't choose an image for a language (a language other than shop's default language) then it will be empty.

screen-recorder-mon-feb-28-2022-12-48-23.mp4

So what is the best solution?

1. Let's to keep empty images if user has not chosen an image (there is a warning in form for this situation)
2. Using shop's default language image for other languages that have not image (For example if user selected image for English, but not choose an image for Persian, then use English image for Persian)

[Progi1984]

@PrestaShop/product-team Could you check the @mparvazi question and give him an answer ?

[MatShir]

@mparvazi I hope you are okay and sorry for the delay :)
Thanks for the suggestion, you make our life easier. I would say option 1, the slider can be used to promote discounts or products depending on the location, and It might be useful for the merchant to be able to manage it by language. If he wants to use the image from the default language, he can still upload it again.
Tell me, what do you think? Hope you are still motivated for the PR.

[mparvazi]

@mparvazi I hope you are okay and sorry for the delay :) Thanks for the suggestion, you make our life easier. If I would say option 1, the slider can be used to promote discounts or products depending on the location, and It might be useful for the merchant to be able to manage it by language. If he wants to use the image from the default language, he can still upload it again. Tell me, what do you think? Hope you are still motivated for the PR.

I'm agree with option one,
AND slide with empty image must be hidden (that means merchant doesn't want to display this slide for a specific language).

I'll work on it to test different situations.

[mparvazi]

@MatShir

Changes:
User can upload image for specific languages in slide.
If image is not defined for a language, then doesn't show empty image slide for corresponding language.

Ready for review.

[matks]

Dear @mparvazi I'm sorry it seems we forgot to add the "Waiting for QA" label so this PR has stayed here, valided from code point of view but not tested by QA and now it has to be rebased (git conflict) 😢

Rebase needed