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[I18n] Update I18n readme (#26631)

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packages/kbn-i18n/README.md
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@ -13,30 +13,7 @@ message syntax.
## Localization files
Localization files have [JSON5](https://github.com/json5/json5) format.
The main benefits of using `JSON5`:
- Objects may have a single trailing comma.
- Single and multi-line comments are allowed.
- Strings may span multiple lines by escaping new line characters.
Short example:
```js
{
// comments
unquoted: 'and you can quote me on that',
singleQuotes: 'I can use "double quotes" here',
lineBreaks: "Wow! \
No \\n's!",
hexadecimal: 0xdecaf,
leadingDecimalPoint: .8675309, andTrailing: 8675309.,
positiveSign: +1,
trailingComma: 'in objects', andIn: ['arrays',],
"backwardsCompatible": "with JSON",
}
```
Localization files are JSON files.
Using comments can help to understand which section of the application
the localization key is used for. Also `namespaces`
@ -107,7 +84,7 @@ when missing translations
For the detailed explanation, see the section below
- `getFormats()` - returns current formats
- `getRegisteredLocales()` - returns array of locales having translations
- `translate(id: string, [{values: object, defaultMessage: string, description: string}])` –
- `translate(id: string, { values: object, defaultMessage: string, description: string })` –
translate message by id. `description` is optional context comment that will be extracted
by i18n tools and added as a comment next to translation message at `defaultMessages.json`.
- `init(messages: Map<string, string>)` - initializes the engine
@ -384,13 +361,13 @@ when missing translations
- `init(messages: Map<string, string>)` - initializes the engine
The translation `service` provides only one method:
- `i18n(id: string, [{values: object, defaultMessage: string, description: string }])`–
- `i18n(id: string, { values: object, defaultMessage: string, description: string })` –
translate message by id
The translation `filter` is used for attributes translation and has
the following syntax:
```
{{'translationId' | i18n[:{ values: object, defaultMessage: string, description: string }]}}
{{ ::'translationId' | i18n: { values: object, defaultMessage: string, description: string } }}
```
Where:
@ -452,20 +429,10 @@ In order to translate attributes in AngularJS we should use `i18nFilter`:
>
```
## Build tools
## I18n tools
In order to simplify localization process, some build tools will be added:
- tool for verifying all translations have translatable strings
- tool for checking unused translation strings
- tool for extracting default messages from templates
In order to simplify localization process, some additional tools were implemented:
- tool for verifying all translations have translatable strings and extracting default messages from templates
- tool for verifying translation files and integrating them to Kibana
While `react-intl` has
[babel-plugin-react-intl](https://github.com/yahoo/babel-plugin-react-intl)
library which extracts string messages for translation, angular wrapper requires
own implementation of such tool. In order to extracrt translation keys from the
template, we have to parse it and create AST object. There is a
[babel-plugin-syntax-jsx](https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-jsx)
plugin which helps to parse JSX syntax and then create AST object. Unfortunately,
there are no babel plugins to parse angular templates. One of the solution can be internal
[`$parse.$$getAst`](https://github.com/angular/angular.js/blob/master/src/ng/parse.js#L1819)
angular method.
[I18n tools documentation](../../src/dev/i18n/README.md)