Fix backendlib - wrong icon returned

Fix backendlib - wrong icon returned

[Issue#]  LINUXWRT-824
[Problem] First icon is always returned from backendlib
          i.e., Curent locale settigns are not taken into account.
[Cause]   This was just not handled before.
            - The exact problem is that after installation icon is ok(notiication)
              but before it is read from package file.
            - This operation does not involve full steps in case of installation.
              Backend lib should do it in more checking to find best icon.
[Solution] Added workaround to return icon according to locale setting

[Verification] Install bm.wgt (W3C P&C icon test) from MyFiles app.
    Icon in "install prompt view" (before installing) and in notification
    should be used for proper locale (change locale to en).

Change-Id: If9d9d32dd2a69914bf72aacf6a82c7881cab2918