Hi.
I saw Textra UI in Persian language. But it have a problem. Basically, when language of apps is a right to left, all/most(Except some special) elements in UI of app should be mirrored. For have a sample, you can set you phone's UI language as Persian/Arabic and see WhatsApp, Android Messages and other default apps in phone.

For example, now in settings, disable/enable buttons(switches) are on right side but they should be on left side and texts in front of them should remain on right side. All of switches and their labels should be like it.

In addition, things like "keep messages" should be on right side but it's value like all or for example 150 should be on left side(while now it's on right side). All things like it in settings should be like it.

In addition, "to" label in send message section should be on right side and text box and add icon(+ and two human icon) that is in front of it should be on left side. And cross(close) icon also should be on left side.

In addition, list of select name of receivers(contacts), all of names should go to right side and green circle(tick) should be on right side of text and text(contact name also) should be on right side of window but left of tick.
Cross(close) icon and tick of that that is beside of cross icon in contact list also should be on left side of screen.
In list of received messages, icon it's colored icon that starting with alphabets of sender's name, should be go on right side of screen and in continue of it should show Number or Name of sender.

In addition, text and rectangle that containing text of received of messages should go to right side of screen.