#!/bin/bash
s='/* Title */
"home.title" = "Welcome";
/* Email */
"home.signup_email" = "Email";
/* recover_email */
"home.signup_email_recover" = "Recover Email";
/* password */
"home.password" = "Enter your __Password__:";
/* One more string */
"my_string_key" = "[Click here](https://m...content-available-to-author-only...l.com/deeplink?id=UUID§ion_id=foo)";'
sed ':a;s/^\([^=]*\)_\([[:alpha:]]\)/\1\U\2\E/;ta' <<< "$s"
IyEvYmluL2Jhc2gKcz0nLyogVGl0bGUgICovCiJob21lLnRpdGxlIiA9ICJXZWxjb21lIjsKIAovKiBFbWFpbCAgKi8KImhvbWUuc2lnbnVwX2VtYWlsIiA9ICJFbWFpbCI7CiAKLyogcmVjb3Zlcl9lbWFpbCAgKi8KImhvbWUuc2lnbnVwX2VtYWlsX3JlY292ZXIiID0gIlJlY292ZXIgRW1haWwiOwogCi8qIHBhc3N3b3JkICAqLwoiaG9tZS5wYXNzd29yZCIgPSAiRW50ZXIgeW91ciBfX1Bhc3N3b3JkX186IjsKCi8qIE9uZSBtb3JlIHN0cmluZyAqLwoibXlfc3RyaW5nX2tleSIgPSAiW0NsaWNrIGhlcmVdKGh0dHBzOi8vbS4uLmNvbnRlbnQtYXZhaWxhYmxlLXRvLWF1dGhvci1vbmx5Li4ubC5jb20vZGVlcGxpbms/aWQ9VVVJRCZzZWN0aW9uX2lkPWZvbykiOycKc2VkICc6YTtzL15cKFtePV0qXClfXChbWzphbHBoYTpdXVwpL1wxXFVcMlxFLzt0YScgPDw8ICIkcyIK