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