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On . By CodimTh
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Drupal 8 incorporates a new templating system for HTML output generation called Twig – see the Drupal 8 theme guide. Twig does not use a native PHP format, so it needs its own solutions for string translations.

Simple text translation is possible with the 't' (or 'trans') filter, while a whole {% trans %} block is supported (as defined by the Twig i18n extension) for more complex scenarios, such as strings with placeholders and singular/plural combinations.

These two do the same; they run the text through t():

Example 1 with t or trans filter:

{{ 'Hello Earth.'|trans }}
{{ 'Hello Earth.'|t }}

 

Example 2 with {% trans %}:

{% trans %}
  Submitted by {{ author.username }} on {{ node.created }}
{% endtrans %}

 

Example 3 translation with variables:

<p class="submitted">{{ "Submitted by !author on @date"|t({ '!author': author, '@date': date }) }}</p>

 

Plural Translations

Making plural translations are now also even easier, just implement a {% plural ... %} switch!

Example:

{% set count = comments|length %}
{% trans %}
  {{ count }} comment was deleted successfully.
{% plural count %}
  {{ count }} comments were deleted successfully.
{% endtrans %}

 

Values are escaped by default. The 'raw' filter can be used to skip escaping. The 'placeholder' filter can be used to form a placeholder. The default behavior is equivalent to @ in t(), while 'raw' matches ! and 'placeholder' matches %:

 

{% set string = '&"<>' %}
{% trans %}
  Escaped: {{ string }}
{% endtrans %}
{% trans %}
  Raw: {{ string|raw }}
{% endtrans %}
{% trans %}
  Placeholder: {{ string|placeholder }}
{% endtrans %}

These will translate Escaped: @stringRaw: !string and Placeholder: %string respectively.

 

{% trans %} & Twig Filters

Filtering Twig variables inside the {% trans %} tag will generally work. However, some of these filters may not work properly or at all. If you are not seeing the desired result or you are receiving fatal errors/WSOD you may need scale down what you are trying to do inside the {% trans %} tag. Create a new Twig variable outside of the tag with this filter applied:

{% set date = node.created|format_date('medium') %}
{% trans %}
  Node was created on {{ date }}.
{% endtrans %}

 

Context and Language Options

 

The t() and format_plural() functions have an $options parameter that can provide additional context or allow a specific language to be chosen for translation. To pass these options in the {% trans %} tag, use the with { ... } syntax in the opening tag:

 

{% trans with {'context': 'Long month name', 'langcode': 'hu'} %}
  May
{% endtrans %}
{% trans 'May' with {'context': 'Long month name', 'langcode': 'hu'} %}

 

This will translate May as a long month name into Hungarian specifically.

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