Remove redundant update translations

Keep it for older releases where we didn't have a clear versioning idea,
but for anything post 2.0 adhere to our version policy and omit
translation updates from release notes.

resources/de.swsnr.turnon.metainfo.xml.in

@@ -35,7 +35,6 @@
             <description>
                 <p>Save and restore main window state.</p>
                 <p>Define additional shortcuts.</p>
-                <p>Update translations.</p>
             </description>
             <issues>
                 <issue url="https://github.com/swsnr/turnon/issues/62">GH-62</issue>