Edit Unity Launcher shortcuts

To edit a shortcut in Unity's quick launch bar, you need to edit the corresponding .desktop file in the menu created.
To see the full list of available shortcuts:

gsettings get com.canonical.Unity.Launcher favorites

This returns an array with all the elements.

tbourdin@tbourdin-ubuntu:~$ gsettings get com.canonical.Unity.Launcher favorites
['application://gnome-terminal.desktop', 'application://firefox.desktop', 'application://thunderbird.desktop', 'application://org.gnome.Nautilus.desktop', 'application://org.gnome.Software.desktop', 'application://unity-control-center.desktop', 'application://shutter.desktop', 'application://filezilla.desktop', 'unity://expo-icon', 'unity://devices', 'application://org.gnome.gedit.desktop', 'unity://running-apps', 'application://org_eclipse_equinox_launcher_1_3_100_v20150511-1540_jar.desktop', 'application://gnome-system-monitor.desktop']

Then identify the file corresponding to our item and edit it in the directory:

~/.local/share/applications/

In our case: application://org_eclipse_equinox_launcher_1_3_100_v20150511-1540_jar.desktop

[Desktop Entry]
vi /home/tbourdin/.local/share/applications/org_eclipse_equinox_launcher_1_3_100_v20150511-1540_jar.desktop

Encoding=UTF-8
Version=1.0
Type=Application
Name=Zend Studio Editor
Icon=org_eclipse_equinox_launcher_1_3_100_v20150511-1540_jar.png
Path=/etc/ZendStudio
Exec=/etc/ZendStudio/ZendStudio
StartupNotify=false
StartupWMClass=Zend Studio
OnlyShowIn=Unity;
X-UnityGenerated=true

Version context

This procedure describes the software and the environment available at the time of its publication. The packages, interfaces, and repositories mentioned may have changed or disappeared; first check the system version and its support level.

cat /etc/os-release
uname -r

Work on a backup or a snapshot, note every modified file, and prepare for rollback. For a current workstation or server, prefer signed packages from officially supported repositories.

Reference: official Ubuntu lifecycle.