Molo.profiles

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- Fixed bug forcing users to add mobile number when not required

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- Update template to only show mobile number field if it's activated and has country calling code
- Show a warning message on CMS if mobile number is activated but country calling code has not been set

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- Added missing button class for templates

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- Updated templates in order to reflect styling changes in modeladmin

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- Removed dependency on wagtailmodeladmin

Backwards incompatible changes
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- Removed use of ``wagtailmodeladmin``: use ``wagtail.contrib.modeladmin`` instead
- ``{% load wagtailmodeladmin_tags %}`` has been replaced by ``{% load modeladmin_tags %}``

NOTE: This release is not compatible with molo versions that are less than 4.0

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- Fix duplicated users via wagtail admin