Add translate command for key mappings.

Under *Custom key mappings* (on the options page), this implements:

    translate x y

Whenever the users types `x` in normal mode or in visual mode, the `x`
is replaced by `y`.

For example:

    map ç l

(which apparently would be helpful on Brazilian keyboards).

Issues:

- Do we want yet another hack like this?  This would be documented only on
  the wiki.

- If we allowed `translate <c-c> <c-[>` (and extended `isEscape()` to
  use the translation), then we'd get the `exitMode` command for free
  (#2253).

- Alternatively, instead of adding a new "command" called `translate`,
  we could overload the existing `map` command.  Since these are
  single-key mappings, there's no ambiguity.  (Although, I guess there's
  a risk some user has junk in their key mappings and would be taken by
  surprise).

Inspired by isssue posted by @vhoyer (#2305).

Fixes #2305.

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