UI locale dbus

[jreidinger]

Problem

There are some string that come from backend and it is displayed to user. But we do not set localization for those strings.

trello: https://trello.com/c/Jp7S5kwh/3398-5-agama-add-support-for-translating-the-messages-from-the-d-bus-interface

Solution

Implement in Locale method to enlist all possible backend localization ( so far only for ruby based ones ) and allow to set localization. In other services have helper that will set initial localization (1) and also catch signal when it is changed (2).
As part of this PR also drop no longer used Language Service.

(1)

class Agama::DBus::FooService
...
      def start
        locale_client = Clients::Locale.new
        @ui_locale = UILocale.new(locale_client)
        export
      end
end

(2) see on_ui_locale_change

Testing

• Tested manually

Screenshots

Example localization in czech ( in czech is only data comming from dbus ):

[lslezak]

Looks OK to me, but someone with Rust knowledge should check it as well... 😃

[imobachgs]

It looks good to me. Just a few suggestions.

[imobachgs]

So we are returning an error if we cannot read any of the dirs, right?

[jreidinger]

yeah, any read failure result in error. I would not expect it unless there is some issue with fs.

[lslezak]

The /usr/share/YaST2/locale/ directory is owned by the base yast2 package so the error should not happen normally.

[coveralls]

coverage: 74.678% (+0.2%) from 74.458% when pulling ffb9dfc on ui_locale_dbus into 2e2e80a on master.

[lslezak]

The /usr/share/YaST2/locale/ directory is owned by the base yast2 package so the error should not happen normally.