Albin

With this pluginyou can face two goals:
· File Replace Sometimes you have an image used in several spots (slider, gallery, feature image, …) and if you remove it and upload it again, as it gets a new ID, you will need to select the new one all around but you could forget a place. To avoid it, use this plugin.
· File Rename Sometimes we upload a file as it comes from the mobile camera and later we realize that the file doesn´t have a ver SEO-Friendly name. Here you can rename the file.
None of both functionalities will breake any link where the image is pointed by its ID but this action doesn´t do a Search and Replace along the post entries.

FileRenameReplace

This plugin let the user renaming or replacing files without breaking links.

AboZain Albanna

Rename Default Post is a simple plugin gives you the ability to Rename your Default Post label to custom name in admin menu. 
Why would I leave my client a menu item that says ?Posts? when they are adding news updates, or portfolio items, 
 So you can simply use this plugin.
<h3>For Example Change Posts to News</h3>
How the plugin works: = 
Go to Settings -> Rename default post.

Rename default post Labels

Awesome

A simple, lightweight WordPress plugin Rename your Default Post labels to custom name in admin menu

FileRenameReplace vs Rename default post Labels