x/text: localization support

[mpvl]

This issue is intended as an umbrella tracking issue for localization support.

Localization support includes:

• formatting values, such as numbers, currencies, and dates in a language- and region-specific way.
• marking text to be translated in fmt-ed text and templates.
• integration into translation pipeline

Details to be covered in design docs.

[Junaid-Sakib]

Do we have the localisation support for date now? Or if anyone can suggest an alternate to have localisation support for dates.

[robfig]

It would be nice to have date localization in x/text. In the meantime, between x/text and github.com/klauspost/lctime everything might be covered. I'm not sure why lctime is archived though.. perhaps that means it won't receive updates to the language rules. cc @klauspost

[klauspost]

@robfig It is a fork from a now deleted package by @variadico

I mainly added a non-stateful interface so it could be used without affecting global package state.

Since I don't really have intentions of maintaining/bugfixing this and there was a low user count, I thought it would be most fair to archive it. If someone wants to maintain a fork I'd be happy to link to it.

[wolfgangmeyers]

golang.org/x/text/number offers a way to localize decimal values, but it seems that I can only initialize the Formatter using a float. I have a need to preserve the precision present in a decimal value that is represented as a string, but when converting to float we are getting rounding errors. It is important to prevent the rounding errors, because we're trying to represent the exact values in financial transactions in different locales. Would it be possible to add support to initialize number.Decimal using a string instead of a float?

[bojanz]

@wolfgangmeyers You might find my package useful: https://github.com/bojanz/currency

It solves the problem of representing and formatting currency amounts for the time being. I'd love to see x/text maintained again though.