I recently realised that no other page or app provided the facility of translating texts above 5000 characters so I created a silly but smart way of translating texts which are too long.
Generally google translate does not allow translation of content above 3900 caharacters - google translate (web) & 5000 characters - google translate app
Since it is possible to change language of entire page hosted on web so i took advantage of this part :)
I created a website which takes input of your texts and creats web-text page in seperate tab this makes it possible to use in-built browser translation and overcome the limitation of 3900/5000 characters imposed on users.
I saw this problem faced by my mother when she receives whatsapp messages which are long and in other language and which cannot be entirely translated by google app.