[FW][FIX] base_vat: make VAT examples translatable

[fw-bot]

Currently some VAT examples that contain other terms than only the number are always displayed in English. This commit makes sure they can be translated.

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Forward-Port-Of: #159051
Forward-Port-Of: #158629

[robodoo]

Pull request status dashboard.

[fw-bot]

@dylankiss @oomsveta cherrypicking of pull request #158629 failed.

stdout:

Auto-merging addons/base_vat/i18n/base_vat.pot
CONFLICT (content): Merge conflict in addons/base_vat/i18n/base_vat.pot
Auto-merging addons/base_vat/models/res_partner.py

stderr:

16:54:04.510743 git.c:463               trace: built-in: git cherry-pick 9fb18174000ff09848b2bf6d21bbe84c7370786b
error: could not apply 9fb18174000f... [FIX] base_vat: make VAT examples translatable
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
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status:

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

⚠️ after resolving this conflict, you will need to merge it via @robodoo.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port

[dylankiss]

@robodoo r+