2.29.1
Bump version
Distribute test data

Otherwise installed tests fail to run out of a tarball release.
Use GLib test setup for installed tests
Forgotten file
tests: Fix up pixbuf tests to know how to find data files

These tests were broken by: 8ec55ff29e0626a05a3aa9d92060e28767ee142f

Previously we were relying on hand-written .test files
which used sh -c and wildcard expansion, but with modern
GLib we can just use g_test_get_dir() to find the datadir
relative to our binary path.
tests/pixbuf-randomly-modified: Drop iterations to 10

1000 iterations takes far too long for automated testing;
we'll get incremental coverage over time even with just
10, and the test can of course be run manually.
Updated Brazilian Portuguese translation
Updated slovak translation
Updated German translation
2.29.3
post-release version bump
Updated Hebrew translation.