Fix Locale.Message tests

[ujihisa]

4 tests were in pending. I fixed them and made sure all of them passed.

[tyru]

hmm, I think @thinca is more appropriate reviewer... (Locale.Message's author)

[ujihisa]

Assigned this to @thinca

[ujihisa]

@thinca
BEFORE:

$ themis --runtimepath ~/.vimbundles/vimproc --reporter dot
......................................................................................................................................P..PPP....................................................................................................................................................................................................................................................P....................................................................................................P..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Pending:
  1) Locale.Message .get_lang() returns current language of message
     Need ja_JP.UTF-8 in your system locale

  2) Locale.Message .get() returns translated text if it exists
     Need ja_JP.UTF-8 in your system locale

  3) Locale.Message .get() returns original text if it doesn't exist
     Need ja_JP.UTF-8 in your system locale

  4) Locale.Message ._() can use like `get()`
     Need ja_JP.UTF-8 in your system locale

  5) Data.String .iconv() return {expr} when the conversion completely fails
     Need knowledge about how to force iconv to fail completely

  6) vital vital#{plugin-name}#import() can be called in &statusline
     "themis cannot test statusline "

tests 1364
passes 1358
pendings 6

AFTER:

$ themis --runtimepath ~/.vimbundles/vimproc --reporter dot
...............................................................................................................................................................................................................................................................................................................................................................................................P....................................................................................................P.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Pending:
  1) Data.String .iconv() return {expr} when the conversion completely fails
     Need knowledge about how to force iconv to fail completely

  2) vital vital#{plugin-name}#import() can be called in &statusline
     "themis cannot test statusline "

tests 1362
passes 1360
pendings 2

This explains the benefit

[thinca]

language message ja_JP.UTF-8 が可能な環境かどうかを Before all 辺りでチェックして、結果を変数に入れておいてよしなにするのがいいかも。

[ujihisa]

Sounds good. Added ffc5fa5 to do that.

[thinca]

We can also check en_US.UTF-8 before test.

[ujihisa]

Sounds even better. Added 3fed30c to do that!

[thinca]

Message.Locale: Refactor test

モジュール名変わってる。

[thinca]

Perfect!

[thinca]

あ、コミットメッセージ…一応直したらマージしてもらえると 🙏

[ujihisa]

Oops, I didn't notice that. Thanks @thinca! fixed.

[tyru]

🎉🎉🎉

[ujihisa]

🎉🎉🎉