I understand your queries. Please find the answers to your queries below.
1) The comments are not supposed to appear in the String translation plugin for translation as comments can not be translated using WPML. However, the string translation is optimized to scan through the entire site and load the valid text strings in the list. Therefore, it is currently not possible to exclude any specific type of string from the string translation.
2) Please be informed that the automatic translation feature can't translate the strings stored in the String translation section. In order to automatically translate them, you need to select the strings and send them for translation. Please check the documentation below for a better understanding.
