fix: APP-540 add support for commas in editable input

[r41ph]

Description

https://regennetwork.atlassian.net/browse/APP-540

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How to test

1. Verify that the decimal and thousands separators reflect the user's location in:

• Order summary card in the editable input and the prices => buy Credits flow step 2
• In the credits and currency inputs => buy Credits flow step 1
• Buy Credits flow success modal
• My Orders page
• ... maybe we should standardise this and use the right numbers format based on location all across the marketplace, wdyt?

While working on this I've been changing the browser's language (in Chrome in Settings > Language > Preferred languages) and putting different languages on top makes the numbers format change. I haven't been able to see this settings update work on the buy credits flow step 1, although I think @blushi can see the French local format (commas) in step 1, is that right?

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[r41ph]

@erikalogie @S4mmyb see testing instructions

[erikalogie]

@r41ph how can I test this, I used my VPN to connect to a place in France but it doesn't seem to work

[r41ph]

@erikalogie I believe is the browser's setting language that is checked for this not the location. The browser is the one handling the numbers formatting (in the cases where they do it, because some browsers/versions just let HTML handle it, which means they don't show commas)