Revert "Updated Spanish translation"

This reverts commit 838fa82eb33835297284c6e9dc6ef884194f5579.
Revert "Updated German translation"

This reverts commit 46ff6a7e03c39cd5556337d8744cbbdfba48e66d.
Bump libgit2-glib requirement to 0.0.18
Fix gi vapi in extra dist
Release version 0.3.3