i18n(ar): Update Arabic keywords

Added also a new keyword word for original source

Author: jermanuts

res/com.system76.CosmicTerm.desktop

@@ -17,7 +17,8 @@ Type=Application
 StartupNotify=true
 Icon=com.system76.CosmicTerm
 Categories=COSMIC;System;TerminalEmulator;
-Keywords=Command;Shell;Terminal;
+Keywords=Command;Shell;Terminal;CLI;
+Keywords[ar]=cli;طرفية;أوامر;صدفة;
 Keywords[pl]=Cli;WierszPoleceń;Powłoka;Terminal;
 Keywords[pt_BR]=Comando;Shell;Terminal;
 Keywords[hu]=parancssor;terminál;