better wording for pass phrase selection

[tomholub]

Originally posted by @tomholub in #323 (comment)

-"setup_save_pass_locally" = "Store pass phrase locally";
+"setup_save_pass_locally" = "Save pass phrase";

-"setup_save_pass_in_memory" = "Keep pass phrase in memory";
+"setup_save_pass_temporarily" = "Remember pass phrase temporarily";