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Relay R26 is indeed the ignition relay so if it looks damaged then it should be replaced. Having shorted the ignition switch to the chassis, I'd be surprised if you haven't blown one or more of the main fuses in the little fuse box in front of the battery, so you should take a closer look at those. Fuses A, B, C, supply current to the interior fuse panel and they should be rated at 80 amps, 60 amps, 60 amps - and I believe you have to remove the battery-mounted fuse box to replace those. Fuses D, E, F are for the cooling fan, heated rear window, and diesel glow plugs respectively, so you probably won't have a fuse F if it's a petrol engine. Is that a 1.6 petrol or 1.8 diesel or what?

If the five main fuses (petrol) or six main fuses (diesel) are ok but replacing relay R26 doesn't bring it back to life then you'll need to start checking the interior fuses. A lot of the fuse slots will be empty so it's best to remove them one at a time to reduce the chances of plugging them back into the wrong slot. If they are all intact then you'll probably need a multimeter or 12V test lamp to start checking voltages to find out where the voltage is missing, because you might have one or more burned-out wires.