Plural improvements for Czech language.

[marcglasberg]

Hello Marcelo,

First of all, thank you for making i18n_extension plugin - it has helped me a lot in my latest project and I will surely use it again in my next Flutter project - it is so easy to set up and use and the code boilerplate is indeed very minimal.

Let me suggest a simple addition to your code (although I have a Github account, I have never used a pull request to contribute to code and I do not want to break things).

For plurals you use:
/// Plural modifier for zero elements.
String zero(String text) => modifier("0", text);

/// Plural modifier for 1 element.
String one(String text) => modifier("1", text);

/// Plural modifier for 2 elements.
String two(String text) => modifier("2", text);

However, in Czech (my language) we use special word form also for amounts 3 and 4 (I am not sure if this applies to other languages as well). For amounts 5 and higher the form stays the same. Simply adding these two modifiers fixed this for me:

/// Plural modifier for 3 elements.
String three(String text) => modifier("3", text);

/// Plural modifier for 4 elements.
String four(String text) => modifier("4", text);
Example:

1 beer 1 pivo

2 beers 2 piva

3 beers 3 piva

4 beers 4 piva

5 beers 5 piv

6 beers 6 piv

7 ... 7 ...

The 'times' modifier can stay as is as most people would not care about 3 and 4 times as we Czechs do.

/// Plural modifier for any number of elements, except 0, 1 and 2.
String times(int numberOfTimes, String text) {
assert(numberOfTimes != null && (numberOfTimes < 0 || numberOfTimes > 2));
return modifier(numberOfTimes, text);
}

Please consider adding this to your code and thanks again for your excellent work.

Tomáš Jeřábek
Consultant/Developer

[marcglasberg]

Fixed for version 1.4.0:

• For Czech language: twoThreeFour plural modifier.