env: add --env0-from option

src/uu/env/locales/en-US.ftl

@@ -6,6 +6,7 @@ env-after-help = A mere - implies -i. If no COMMAND, print the resulting environ
 env-help-ignore-environment = start with an empty environment
 env-help-chdir = change working directory to DIR
 env-help-null = end each output line with a 0 byte rather than a newline (only valid when printing the environment)
+env-help-env0-from = read NUL-terminated environment entries from FILE, or standard input if FILE is '-'
 env-help-unset = remove variable from the environment
 env-help-debug = print verbose information for each processing step
 env-help-split-string = process and split S into separate arguments; used to pass multiple arguments on shebang lines
@@ -33,6 +34,7 @@ env-error-use-s-shebang = use -[v]S to pass options in shebang lines
 env-error-cannot-unset = cannot unset '{ $name }': Invalid argument
 env-error-cannot-unset-invalid = cannot unset { $name }: Invalid argument
 env-error-must-specify-command-with-chdir = must specify command with --chdir (-C)
+env-error-env0-from-not-nul-terminated = { $file }: file must be empty or end with a NUL byte
 env-error-cannot-change-directory = cannot change directory to { $directory }: { $error }
 env-error-argv0-not-supported = --argv0 is currently not supported on this platform
 env-error-failed-set-signal-action = failed to set signal action for signal { $signal }: { $error }