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Do you add multilingual support (Angular)?
  v6.0 Posted at 16/06/2020 3:07 AM by Tiago Araujo

How to implement multilingual support in an Angular project?

There are several ways of implementing multilingual support in an Angular project, the following libraries are popular:
 
Internationalization (i18n): the standard Angular built-in module to help the application dealing with multilingual. It creates multiple language versions of your application.
  
ngx-translate: a library enhanced the Angular built-in feature, it supports not only template translations but can also be used in the code by APIs. 
 
angular-gettext:  the simplest powerful 3rd party library providing translation support to Angular.
 
The following table shows the pros and cons of the 3 libraries:

 

Pros (+)

Cons (-)


Internationalization

(i18n)

  • Better support of displaying dates, numbers, percentages, and currencies in a local format.
  • Better support for handling plural forms of words, and alternative text.
  • It only works with one language at a time, you have to completely reload the application to change the language
  • Only support translation in the template (by using HTML tag)
  • You need to build + deploy every time you make a change to the language, and you have to have a separate folder every time.
  • You can see the language in the URL.

ngx-translate

  • It provides more powerful API support
  • It supports JSON files by default to store the translation resources
  • It doesn’t provide good support for plural forms and dates.
  • Ngx-translate will stop its releases when angular built-in modules catch up with the ngx-translate features.
  • The developer said that when Angular i18n catches up the library will be deprecated. Check article.
angular-gettext
  • The simplest library to deal with multilingual.
  • Supports plural handling in different languages.

  • It compiles the translations during the compiling period, which doesn’t support the change of translation at any time.
  • Only supports AngularJS

 

Ngx-translate provides the APIs which you can use to translate the resources in the code:

code-1.png

code-2.png 

By comparing the 3 libraries we can see ngx-translate provides the best functionality now due to the API support, even though the built-in i18n module will catch up at a certain time, but we still recommend using ngx-translate for multilingual support in your Angular application.

The future…

Since Angular 9, they now have built-in support for i18n which is called Angular Localized, it is expected that over time, Angular Localize will become the most popular (see the yellow line on Google Trends increase).

angular-trends.jpg
Figure: It is expected that the yellow line will become the dominant internationalization tool for Angular

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