zoom slider: impl as scoped_ptr and reduce code duplication

Change-Id: I274e731c70c2735f513e9e8fbf2273aa52310fd2
zoom slider: remove unneeded whitespaces

Change-Id: I220a4074c6d62a89aaab435210f52300c63315b2
reduce nesting at SID_CHINESE_CONVERSION

Change-Id: I9ebf5f39b58839b79bdef9a93a2113d7566d05da
fdo#36772 Move the scrollbar and sheet tabs in a separate row.

Change-Id: I57d891d9f6e89dafb4840a577ba55baa734fdcc2