Add placeholder for Feedback fields and Persian Localization

[azarbara]

…ion,Country,PostalCode,Telepone,Message fields in form and field setting, Also add Persian (fa-IR) localized files

The placeholder is a main part of any textbox so I decided to add this to inputs.

Changes made

I add placeholder field after each input in "Form and Field Setting" section save the values in ModuleSetting table and finally show them in feedback form

also I add Persian resx file to localize to persian (fa-IR)

[WillStrohl]

This looks like a solid update, but I'm not the module "owner" at this time. I'll let @valadas or someone else chime in further.

[azarbara]

@valadas could you please check this PR!

[valadas]

It is on my list for open-source stuff. That list is a bit large and I am preparing for DNN Connect the next few weeks of my free time. It looked ok from a quick look but wanted to take the time to look at this properly.

[uzmannazari]

could you please publish this pull request mr valadas?