Drop deprecated Encoding key from desktop files
The Encoding key is no longer required, all desktop files are assumed to
be UTF-8 encoded. See details at:
Fix various typos and misspellings
lintian, Debian's package checker, uses strings to check for common typos
in compiled binaries. This change fixes the ones it identified in 0.22.1.
Differential Revision: https://phab.enlightenment.org/D5585