This plugin allows you to write posts in more than one language, all you have to 
do is to add some divs to your posts, each div with a class, that is the 
language’s name. This way your readers will be able to just click in the flags 
and change between languages.

WPMultiLanguageChanger

This plugin allows you to write and you readers to change between languages in your blog in a easy way.

Sibin Grasic

Oblak Studio

<h3>SrbTransLatin: The BEST WordPress transliteration plugin</h3>
SrbTransLatin enables you to have both cyrillic and latin scripts on your website. Transliteration is done in-place automatically.
<h3>Features (v3+)</h3>
Transliteration features:
<ul>
<li>Website content is automatically transliterated into latin</li>
<li>Ajax calls are transliterated into latin (both JSON and HTML)</li>
<li>Your visitors can search cyrillic content using latin script</li>
<li>Selective transliteration via shortcodes – Force parts of your website to stay in cyrillic script, use custom transliteration (Gutenblocks coming soon)</li>
</ul>
Performance features
<ul>
<li>Cache plugin compatible – No reinventing the wheel. Works OOB with all the popular caching plugins.</li>
<li>SEO Friendly – no double content or SERP penalties!</li>
<li>Optimized autoloading – Plugin is PSR-12 compatible and loads the functionalities only when needed</li>
</ul>
File and Media features
<ul>
<li>Script specific files – You can have separate versions of images or other files for cyrillic and latin scripts</li>
<li>Filename transliteration – Cyrillic uploads are automatically converted to latin script</li>
</ul>
Script Selector features
<ul>
<li>Append the script selector to any menu of your choosing – Either as a dropdown, or inline</li>
<li>Selector widget – place it any sidebar you’d like</li>
<li>Custom function – Use <code>stl_selector</code> function anywhere in the code (but read the docs first)</li>
<li>Works everywhere – Plugin hooks into WordPress core transliterating your content inplace</li>
</ul>
MultiLanguage features
Tested with:
<ul>
<li>PolyLang</li>
<li>WPML</li>
<li>TranslatePress</li>
<li>qTranslateX</li>
</ul>
<h3>Documentation</h3>
If you can’t find your anwsers in the FAQ below, documentation can be found <a href="https://rtfm.oblak.studio/srbtranslatin" rel="nofollow ugc">here</a>
<h3>Authorship</h3>
Original version of this plugin was developer by <a href="https://pedja.supurovic.net/" rel="nofollow ugc">Predrag Supurović</a>. 
Plugin development was handed over to <a href="https://oblak.studio" rel="nofollow ugc">Oblak Solutions</a> in march 2020. Since then, we am the sole authors and maintainers of the plugin

SrbTransLatin – Serbian Latinisation

SrbTransLatin plugin allows you to use both Cyrillic and Latin scripts on your website.

WPMultiLanguageChanger vs SrbTransLatin – Serbian Latinisation