Kotti-contactform

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- Allows to override templates in other addon. [castaf]

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- Migrate to Bootstrap 3.
This requires ``Kotti>=0.10b1`` and is a **backward incompatible change if you have customized any template**!

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- Fix the RecaptchaWidget serializer that hasn't been working at all before.

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- Integrate optional captcha service for the contact form.
- Require Kotti>=0.9.2
- Add an additional sender column.
Using the user supplied email address as the mail sender fails if the sender domain has an SPF record and the receiving mail server checks SPF records.
You need to run the migration script or add the column yourself (on SQLite).

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- Added frech translation. [jon1012]