Error descriptions

[astyled]

• actually confirm there isn't anything we don't want to display in .Error
  • https://github.com/userstyles-world/userstyles.world/blob/dev/handlers/review/create.go#L85
  • https://github.com/userstyles-world/userstyles.world/blob/dev/handlers/review/edit.go#L73
  • https://github.com/userstyles-world/userstyles.world/blob/dev/handlers/user/account.go#L85
• replace generic "Internal server error" ones these are mostly passed in Title, not Error
  maybe give something more descriptive to these:
  • https://github.com/userstyles-world/userstyles.world/blob/dev/handlers/user/verify.go#L54
  • https://github.com/userstyles-world/userstyles.world/blob/dev/handlers/user/verify.go#L77
• add some new ones they're lacking in most places, but Titles do contain some useful information about errors in these cases.