Changed the color of found text from red to high contrast (#9315)

* Increases the font weight and font size of found text for readability
* Adopted high-contrast colors (yellow and purple)
* Updated CHANGELOG.md

Co-authored-by: Christoph <siedlerkiller@gmail.com>
Co-authored-by: ThiloteE <Thilo.Ertel@posteo.de>

CHANGELOG.md

@@ -45,6 +45,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where a message about changed metadata would occur on saving although nothing changed. [#9159](https://github.com/JabRef/jabref/issues/9159)
 - When adding or editing a subgroup it is placed w.r.t. to alphabetical ordering rather than at the end. [koppor#577](https://github.com/koppor/jabref/issues/577)
 - We modified the Directory of Open Access Books (DOAB) fetcher so that it will now also fetch the ISBN when possible. [#8708](https://github.com/JabRef/jabref/issues/8708)
+- We changed the color of found text from red to high-contrast colors (background: yellow; font color: purple). [koppor#552](https://github.com/koppor/jabref/issues/552)
 - We modified the "Delete file" dialog and add the full file path to the dialog text. The file path in the title was changed to file name only. [koppor#534](https://github.com/koppor/jabref/issues/534)
 - Download from URL now automatically fills with URL from clipboard. [koppor#535](https://github.com/koppor/jabref/issues/535)
 

src/main/java/org/jabref/gui/entryeditor/EntryEditor.css

@@ -122,7 +122,11 @@
 }
 
 #bibtexSourceCodeArea .search {
-    -fx-fill: red;
+    -rtfx-background-color: #ffff00;
+    -fx-fill: #7800A9 ;
+    -fx-font-size: 1.2em;
+    -fx-font-weight: bolder;
+
 }
 
 #citationsPane {