I hope you should consider issuing Arabic World Day stamps as a way to celebrate and promote this important cultural event , even tho it's world day event but the arab community of the app would deserve it

Arabic as one of the six UN official languages. the Language of Poetry and Arts.

UN Arabic Language Day (Arabic: اليوم العالمي للغة العربية) is observed annually on December 18.

The event was established by the UN Educational, Scientific and Cultural Organization (UNESCO) in 2010 seeking "to celebrate multilingualism and cultural diversity as well as to promote equal use of all six of its official working languages throughout the organization". December 18 was chosen as the date for the Arabic language as it is "the day in 1973 when the General Assembly approved Arabic as an official UN language".