If you have an official version of the translation app installed, you may need to uninstall it first before installing the taptotranslate161_signapk version, as they may have conflicting signatures.
This guide explains what is, its likely purpose within Android customization, and how to use it safely. What is taptotranslate161_signapk ? taptotranslate161_signapk
Where did you (e.g., specific forum, developer site)? If you have an official version of the