Swift proxy: fix packages installation

Install the swift package on ubuntu to get swift-ring-builder.

Install the same packages on debian and ubuntu.

Change-Id: I3ee1d0c13d03a3938642774fb5699fd18c1cea81
Closes-Bug: #1318028
Backport: icehouse
Add translation test gate

Test that the translated manuals can actually be build. This tests all
currently supported manuals for building so that we can see which books
currently built - and which fail.

Change-Id: Ia867e94511092cb638493634ea1f7b7e417a5c52
Merge "Add translation test gate"
Merge "Swift proxy: fix packages installation"