preferencestore (#15018)

* Starting migration

* Migration finished

* Fix i18n

* Fix some tests

* Fix typos

* Remove overwite of http status

* Add i18n string

* Fix i18n

* fix breakages

* fix tests

Co-authored-by: Rodrigo Villablanca <villa061004@gmail.com>

app/export.go

@@ -281,8 +281,8 @@ func (a *App) buildUserTeamAndChannelMemberships(userId string) (*[]UserTeamImpo
 		}
 
 		// Get the user theme
-		themePreference, err := a.Srv().Store.Preference().Get(member.UserId, model.PREFERENCE_CATEGORY_THEME, member.TeamId)
-		if err == nil {
+		themePreference, nErr := a.Srv().Store.Preference().Get(member.UserId, model.PREFERENCE_CATEGORY_THEME, member.TeamId)
+		if nErr == nil {
 			memberData.Theme = &themePreference.Value
 		}