Set default launguage for display name of account

Set default launguage for display name of account

[Issue#]   N_SE-54261
[Problem]  The default language in account menu is not showing in Settings.
[Cause]    The default language is not specified in the manifest file.
[Solution] - If there is "en-gb" in display name of account, installer set
             "en-gb" as default language.
           - If there is not "en-gb" in display name, installer set the first
             value from display name as defalt language.

[Verification] Install the attached widget.
https://bugs.tizendev.org/jira/secure/attachment/164604/Emptyui.zip

[SCMRequest] N/A

Change-Id: I438ec0cd6fb16da9fd182138853bbeef63ccbd30