bb_string_transliterate calls do not check return codes
check for and handle return values gracefully
a*|A*) # transliterate to ASCII
bb_string_transliterate format_mod_apply__transtmp "$_value" \
ascii
_value="$format_mod_apply__transtmp"
_mod="${_mod:1}"
;;
u*|U*) # transliterate to username
bb_string_transliterate format_mod_apply__transtmp "$_value" \
username
_value="$format_mod_apply__transtmp"
_mod="${_mod:1}"
;;