Add plural support

[chrztoph]

Add a new option to activate plural support for keys. On activation show the following fields:

• zero
• one
• two
• few
• many
• other

For Android there is an own data format to export such plural keys.

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <plurals name="demo_plural">
        <item quantity="one">%1$d book</item>
        <item quantity="other">%1$d books</item>
    </plurals>
</resources>

https://unicode-org.github.io/cldr-staging/charts/37/supplemental/language_plural_rules.html

[Nonouf]

@chrztoph What's up with plural support? Are you by any chance planning to support it soon? Thanks!

[chrztoph]

Yes, we already started developing plural support. Expect it to be ready in January.

[weakfl]

There's still no "Zero" option. Any plans to add this any time soon?

[chrztoph]

Hey, plural support has already been added. Which options are available depends on the language you have chosen (according to the CLDR Language Plural Rules). The zero options is also available.

[weakfl]

The zero options is also available.

@chrztoph where exactly? 👇

[chrztoph]

Well English hast not a dedicated form for Zero, but I must admit that this might be useful sometimes to have a special text for example if there are 0 elements. I created another ticket for that here: #168