malaiac

This plugin allows you to use DeepL translation API to translate posts ( and pages ) right from your WordPress Admin. 
Adds a translate button to the edit post page. 
Shows current and remaining API usage.
This plugin requires an active DeepL API subscription with access to the API. 
Please note that DeepL User or Teams plans do NOT include API access. 
You have to get a <a href="https://www.deepl.com/fr/pro/change-plan#developer" rel="nofollow ugc">“DeepL Developer” plan</a> (both ‘DeepL API Free’ and ‘DeepL API Pro’ work with this plugin)
Want to translate Products, meta fields, or translate in batches ? 
Get the <a href="https://solutions.fluenx.com/en/produit/batch-deepl-translation-for-wordpress-posts/" rel="nofollow ugc">DeepL Pro API plugin</a>
Please note : the free and the premium version works the same relative to content editors ( Elementor, Blocks, etc.). You’re free to test this plugin on your website to see if your specific configuration works well with the plugin. We cannot guarantee that all content editors work perfectly with the DeepL API so please test this plugin before buying the premium (you’ll need the premium only if you need extended features like meta translations and batch translations)

DeepL API translation plugin

I have tested the plugin about 1-2 years ago and a lot has changed since then: By now it works absolutely stable for the translations of our content, which are created with the block editor. You can set the languages beforehand and also correct the translations manually. We use this plugin now on several websites in combination with WPML. 

Important: You need a DeepL developer API (the personal DeepL license does not work) and you should have a close look at the error log if something does not work. A setup wizard would be recommendable here!

Good slim tool

Get DeepL translation magic right into your WordPress Admin

Vocabla

It lets your international visitors translate English words using double click. 
8 languages are covered: Spanish, Portuguese, Chinese, Arabic, Russian, Turkish, Vietnamese, Polish. 
Other users get English definition.
After installation no additional setup is required. It just works:
<ol>
<li>Box with one line instruction for users is presented below every post title:</li>
</ol>
“New English word? Translate any word using double click.”
<ol>
<li>
When user double-clicks on an English word in your article, he gets word translation in his browser’s language or an English definition.
</li>
<li>
That’s all! More international visitors can understand articles from your website 🙂
</li>
</ol>
<h3>Loading JS from http://vocabla.com</h3>
To provide the best service of translation, we need to communicate with Vocabla servers where we keep the translation data and audio for the translated words.
<h3>Arbitrary section</h3>

Translate English Words by Vocabla

It lets your international visitors translate English words using double click.

DeepL API translation plugin vs Translate English Words by Vocabla