VAT: Update to better translation strings for VAT form in checkout

[JessBoctor]

Reported in pcYYuD-1RW-p2

We received some feedback from a self-serve interview completed by @fredrikekelund. One point mentioned was that the literal translations from English to Swedish in the VAT form led to user confusion because they didn't sound native at all.

This happens because the translation strings in the VAT form use a placeholder for the tax name. For example, the translation string for the company name field is Organization for %s (where %s is most commonly replaced with VAT, but sometimes with e.g., GST).

Per Team Global's recommendation (pcYYuD-1RW-p2#comment-1932), we should use strings without placeholders since this will permit much better translations than we currently have. I.e., instead of Organization for %s, we should include several complete strings in the code (Organization for VAT, Organization for GST, Organization for CT, Organization for tax).

We should make sure that the strings are updated both in the Checkout Billing Information field and in the VAT/Tax information form in https://wordpress.com/me/purchases/vat-details

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• pcYYuD-1RW-p2#comment-1932

[michaeldcain]

I think we need to be careful here, because tax names are country-specific, whereas languages aren't. Swedish is probably a bit of outlier here, but we ran into this previously with French speaking users that aren't in France.