"I like this picture."
Translation:Is toil leam an dealbh seo.
They say that toigh is accepted - see here.
So if it isn't, please report it as a fault as they do not have time to read all the comments unless it is flagged with a report. But please note that if you make any other mistake, it may say you are wrong and give toil as the correct answer. When this happens it is easy to think there was something wrong with the toigh.
To be absolutely 100% certain that you have not made any other mistake, try the following
Next time toigh is marked wrong, copy what they say is the correct answer (using the copy and paste thing - highlight the text and press Ctrl+C). Next time the question comes up - which it will after you make a mistake, if you are not doing a test - paste in the answer (Ctrl+V) and alter the toil to toigh. If it still says you have made a mistake then report it. It appears you cannot do this on a phone, though.
Toil is now considered the preferred spelling, though it makes me cringe. This is because it is an eggcorn. The original word is toigh which means 'agreeable'. Is toigh leam etc. got misheard as Is toil leam because of the following l, and because toil makes a bit (but not a lot) of sense as it means '1 desire, will, wish 2 inclination, volition 3 pleasure, delight' (AFB) which isn't exactly what Is toigh leam means.