Here is one formal title in English:

Somalia Trains Journalists to Counter Al-Shabaab Propaganda and Disinformation

Other formal options (for consideration):

• Somalia Hosts Journalist Training to Combat Al-Shabaab Disinformation
• Somali Journalists Receive Training to Counter Al-Shabaab Propaganda
• Somalia Bolsters Media Capacity to Counter Al-Shabaab Propaganda

The first option is recommended for its clarity, formal tone, and direct alignment with the original request.