[FIX] website_blog: fix sidebar overflow

When a tag has a very long name, on a screen too narrow, the sidebar
overflows outside of the screen and a horizontal scrollbar appears.

By allowing the tags to wrap, the overflow does not occur any more,
excepted if there is a very long word. In that case, we truncate it.

Same goes in the short blog post template, excepted that the parent's
width is already specified.

closes odoo/odoo#44424

X-original-commit: a5ff42ce
Signed-off-by: Paul Morelle <madprog@users.noreply.github.com>