Changed the color of found text from red to green

[u7232539]

Fixes koppor#552.

This issue is about changing the text color from red to green to avoid misunderstanding in the search.

Before:

The text color of the search was red, which may make users think there was an error in the search.

After:

Highlighted the search text in green color to avoid misunderstanding.

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

I would like to know what you think about the fix. Any comments would be appreciated.

[Gpax971]

Green seems to blend in a little, is it possible to make it bold or change text background?
Also, you should change or censor most of that file path, since it makes it incredibly easy to identify you as a person

[u7232539]

@Gpax971 Thanks for the comment. I kept the green color and increased the font size and weight for readability.

Latest version:

[Gpax971]

Looks good now. May want to remove the original picture for privacy though

[koppor]

Would it be possible to submit this PR to https://github.com/JabRef/jabref/pulls?

[u7232539]

I just submitted the PR. JabRef#9315