[FIX] website_mail: sanitize email templates when displaying templates selection

In cases the templates is not html syntax valid
[FIX] website_mail: t-field replace by t-esc as html_sanitize applied on the field
Fix two possible AsciiErrors when an exception occurs

Signed-off-by: Sandy Carter <sandy.carter@savoirfairelinux.com>
Merge pull request #2620 from savoirfairelinux/8.0-http-unicode

Fix two possible UnicodeDecodeError when an exception occurs
[FIX] bus, im_chat : set bus and im_chat in auto install to set im_odoo_support in auto install too.
[FIX] Non printable character 0x07h in website's german .po (Fixes #2688)
[FIX] account: default product taxes on product.template

As product.template is now most commonly used than product.product
[FIX] tools: remove useless attributes