[FIX] ir.ui.view: qweb translations: allow looking up translation in parent template

- Translations lookup normally uses the namespace of the current
QWeb template, after merging all inherited views.
But when a QWeb template is "cloned" by a child view using
inheritance with `primary` mode, the translations are more
likely to exist for the original (parent) template, and would not
be found when using only the "child" namespace.
This patch adds support for looking up each translation
also in the parent namespace in this case, if none was found
for the child template in the first place.

- ir.translation's _get_source() now supports a list of res_id
to search for, in addition to a single res_id

- Also moved the logic of routes /website/customize_template_get
and /website/get_view_translations to the ir.ui.view model where
it belongs.

opw: 615241

Closes #5325

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