Bug 1080828 - [Messages][RTL] International phone numbers and groupmms threads are not correctly displayed. r=julien

To be honest, I can't say what should be expected result in this case :) Eg. if we have
```Aleh Zasypkin, عبد الحميد```

In LTR it's:
```Aleh Zasypkin, بد الحميد.....```

In RTL it's:
```.....eh Zasypkin, عبد الحميد```

Do you think it should be like below?

In LTR:
```Aleh Zasypkin, .....عبد الحمي```

In RTL:
```Aleh Zasypk....., عبد الحميد```