Make the Requested amount field accepts locale formated values

[frjo]

Fixes #4628

Add custom to_python() function to allow localised number inputs to Requested amount field. Add custom prepare_value() to make the widget use the locale correct decimal separator.

Test Steps

• Try saving all number format you know about. 10000 can in different countries be written as "10 000", "10000.00", "10 000,00", "10.000,00", "10,000.00". They should all be saved as "10000" in the database.
• Try to set the site to different locales and combine with different number format. All combinations should work.

[frjo]

I used up a lot of Claude code tokens for this 😄. So many nitty gritty details but after hours of testing I believe (hope) it's working.

Really needs testing by other people, important that this does not mess up users data.

If we can be sure it works I think it will be a nice ux improvement, allowing users to enter values the way they are used to and Hypha takes care of the rest.

[frjo]

@bmispelon I heard you created a solution for this already. Something similar to above or did you find a cleaner fix for it?

[wes-otf]

pretty cool how intelligent this field is now! initial testing is looking pretty good, going to keep probing a little deeper later this afternoon for edge cases

[wes-otf]

In my testing numbers with spaces for separators don't validate - it was in the test steps but not the unit tests so not sure if it was intended to work or not

[wes-otf]

I think it's ready other than that! would be cool to get input from folks that actually will be utilizing this though

[frjo]

Will see about allowing spaces on input.

[frjo]

A small change makes it possible to add all the spaces you like on input, they are removed when user submit form.