unclego

Lets you have your backend administration panel in english or any installed language, even if the rest of your blog is translated into another language. Language preferences can be set per user basis in user profile screen.
Tested on MultiSite.
Deals with frontend ajax requests
Notice: 
After release of WordPress 4.7 this plugin is a bit obsolete.
In WordPress 4.7 users are able to select their preferred locale (language) when editing their profile. Plugin add exact same functionality to pre 4.7 WordPress.
I still maintain it for people with outdated WordPress sites. And the plugin is still usefull for sites with outdated plugins that not obey get_user_locale(). 
<a href="https://make.wordpress.org/core/2016/11/07/user-admin-languages-and-locale-switching-in-4-7/" rel="nofollow ugc">More info</a>

Admin Language Per User

a must have for multilingual sites

Switch your backend administration panel in any installed language per user basis.

Benjamin Intal

gambitph

Properly capitalize your English post titles, page titles and heading blocks after you type it.
Very useful when writing articles and web pages.
After activating, your post title fields and heading blocks will auto-capitalize when typing in it. This doesn’t modify your existing posts.
<h3>How It Works</h3>
This plugin uses the title case rules of <a href="https://en.wikipedia.org/wiki/AP_Stylebook" rel="nofollow ugc">AP</a>/<a href="https://en.wikipedia.org/wiki/APA_style" rel="nofollow ugc">APA</a>.
Type in your post title or Heading block, then click out and the text will get capitalized.
Works in: 
– Block Editor / Gutenberg 
– Site Editor 
– Classic Editor
Capitalizes: 
– Page / Post / CPT Title 
– Heading Blocks 
– <a href="https://wordpress.org/plugins/stackable-ultimate-gutenberg-blocks/" rel="ugc">Stackable Heading Blocks</a>
<h3>Examples</h3>
the quick brown fox jumps over the lazy dog ➡️ The Quick Brown Fox Jumps Over the Lazy Dog 
Perfectly capitalized headings in wordpress ➡️ Perfectly Capitalized Headings in WordPress 
best iPhone app for Runners-In-Training ➡️ Best iPhone App for Runners-in-Training

Capitalize Titles and Headings

Properly capitalize your English post titles, page titles and heading blocks after you type it.

Admin Language Per User vs Capitalize Titles and Headings