taxonomy: adding syn gluten (#9069)

Update allergens.txt

taxonomies/allergens.txt

@@ -21,7 +21,7 @@ nl:Geen, Allergeenvrij, Zonder allergenen, Zonder, Geen allergenen, 0
 sk:žiadne, bez alergénov, bez, 0
 sr:ništa, nijedan, nijedno, bez alergena, nema alergena, bez, 0
 
-en:gluten, cereals containing gluten, barley, barley malt flour, malted barley, malted barley extract, malted barley flour, kamut, rye, rye flour, spelt, speltflour, wheat, wheat flour, wheatflour, wheat semolina, oats, oat fiber
+en:gluten, cereals containing gluten, other cereals containing gluten, barley, barley malt flour, malted barley, malted barley extract, malted barley flour, kamut, rye, rye flour, spelt, speltflour, wheat, wheat flour, wheatflour, wheat semolina, oats, oat fiber
 ar:غلوتين
 bg:глутен, ечемик, ечемичен, ечемично-малцов, пшеница, пшенично, пшеничено, ръж, овес, спелта, камут, хоросан, вид едра твърда пшеница, лимец, булгур 
 bs:gluten