Retrieves a value from the component's message catalog.

从组件的信息目录中找回一个值。

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Provide an own message catalog containing the required message id.

提供包含所需消息id的自己的消息目录。

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If you change a property file in a message catalog, you'll see the change immediately, just as with component classes and component templates.

如果你在信息目录中更改了一个属性文件，你将立刻看到改变。就像组件类和组件模板一样。

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