[FIX] base: almost-duplicated translations ignored during import

Translations are not transfered from temporary table tmp_ir_translation_import
to ir_translation if translation already exists (using `find_expr`).
In case of import of QWeb terms (name = 'website'), the criteria was too weak,
finding already present terms in translations for different modules.
e.g. term "Quantity" is already present in a QWeb view from sale module and was
not imported for the translations of the website_sale module.
Fixed by adding the filter criteria 'irt.module = ti.module'

In case QWeb translations for the same term in the same modules were added in
two imports (second term added in the future), the second was still ignored.
Changed condition to check the res_id for views as well.

Fixes #4239