AP_Arming: shorten Accels failure message

This allow the message to fit on the MP HUD

libraries/AP_Arming/AP_Arming.cpp

@@ -189,13 +189,13 @@ bool AP_Arming::ins_checks(bool report)
         }
         if (!ins.get_accel_health_all()) {
             if (report) {
-                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accelerometers not healthy");
+                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accels not healthy");
             }
             return false;
         }
         if (!ins.accel_calibrated_ok_all()) {
             if (report) {
-                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: 3D accelerometers calibration needed");
+                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: 3D Accel calibration needed");
             }
             return false;
         }
@@ -203,7 +203,7 @@ bool AP_Arming::ins_checks(bool report)
         //check if accelerometers have calibrated and require reboot
         if (ins.accel_cal_requires_reboot()) {
             if (report) {
-                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accelerometers calibrated requires reboot");
+                GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accels calibrated requires reboot");
             }
             return false;
         }
@@ -237,7 +237,7 @@ bool AP_Arming::ins_checks(bool report)
                 }
                 if (AP_HAL::millis() - last_accel_pass_ms[i] > 10000) {
                     if (report) {
-                        GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accelerometers inconsistent");
+                        GCS_MAVLINK::send_statustext_all(MAV_SEVERITY_CRITICAL, "PreArm: Accels inconsistent");
                     }
                     return false;
                 }