Crop new onboarding image to match existing proportions

Author: emanuele-f

app/src/main/res/drawable/firewall_block.jpg

@@ -380,7 +380,7 @@
     <string name="app_intro_geolocation_msg">PCAPdroid can query a local database to determine the country of a remote server\n\nYou must first download the geolocation database from the app settings</string>
     <string name="vpn_setup_msg">PCAPdroid simulates a VPN in order to capture the network traffic without root.\n\nTo start the capture, you need to accept the VPN request in the next screen.\n\n<b>NOTE:</b> to proceed, disable any configured Always-on VPN from the Android settings</string>
     <string name="app_intro_traffic_inspection">Inspecting HTTP requests, responses and raw data is easy, thanks to the built-in decoders\n\nGot an encrypted connection? You can enable the <a href='%1$s'>TLS decryption</a> to get the decrypted data</string>
-    <string name="app_intro_firewall_msg">With the integrated <a href='%1$s'>Firewall</a> you can easily block Internet access to individual apps , domains and countries too\n\nCombine this with the built-in traffic visibility to get the ultimate tool to protect your privacy</string>
+    <string name="app_intro_firewall_msg">With the integrated <a href='%1$s'>Firewall</a> you can easily block Internet access to individual apps, domains and countries\n\nCombine this with the built-in traffic visibility to get the ultimate tool to protect your privacy</string>
     <string name="app_intro_malware_detection">Enhance the security of your device with the <a href='%1$s'>malware detection</a> feature\n\nBy using up-to-date blacklists, it can detect, block and alert malicious connections in real-time</string>
     <string name="app_intro_traffic_dump">PCAPdroid provides <a href='%1$s'>multiple ways</a> to dump the traffic in the standard PCAP format for further analysis\n\nVia the <a href='%2$s'>PCAPdroid extensions option</a>, you can add app names to the packets and display them in Wireshark</string>
     <string name="permission_granted">%1$s permission was granted</string>