Fix some phrase are not translated in japanese.

Some phrase are not translated in japanese since 1322df757bedb3be4453253e39dcabe78be14d64 was committed.
Other language has no it problem, because they using `MT/L10N/*.pm` when translated.

A key of YAML such as `foo\::` (It include escape sequence.) are correct as a YAML syntax, but incorrect as a translation text.

I checked this test success. (It test script put to `/path/to/mt`)
A key like `foo::` (It not include escape sequence.) has no problem in `YAML::Syck` and `YAML::Tiny`.

```perl```
use strict;
use warnings;

use lib qw(lib extlib t/lib);

use Test::More;

use MT;
use MT::Test;

sub test {
    my $module = shift;
    MT::Util::YAML::_find_module($module);
    is($MT::Util::YAML::Module, "MT::Util::$module", "YAMLModule is MT::Util::$module");
    my $yaml = <<YAML;
foo:: bar
YAML
    my $yaml_obj = MT::Util::YAML::Load($yaml);
    is((join '', keys %$yaml_obj), 'foo:', "foo:: is correct key for MT::Util::$module");
}

test $_ for (qw(YAML::Tiny YAML::Syck));

done_testing;
```

Or fix translation function.