Update form_setup_html.php

add t-function for the string "levels"
Line endings in Unix format
PRS-2 coding style
Use getAttributeKeyDisplayName
Use getAttributeSetDisplayName
Avoid scrolling to top when removing attributes
Avoid scroll to top when adding attributes
better date nav localization
t-functions to form.php of core_conversation block
t-functions to form.php of discussion block
Merge pull request #650 from mlocati/scroll-problem-removing-page-attribute

Avoid scrolling to top when removing attributes
Merge pull request #640 from mlocati/attribute-attributeset-displayname

Use display names for attributes/attribute sets
Merge pull request #658 from concrete5russia/patch-2

t-functions to form.php of core_conversation block
Merge pull request #659 from concrete5russia/patch-3

t-functions to form.php of discussion block
Merge pull request #660 from concrete5russia/patch-1

Update form_setup_html.php