Fix 2 bugs in translation tools

- Division by zero --> Error
- Properties with space
trying to be a bit more helpful
Improve French translations
Remove unnecessary executable bits on source files
Fix windows-slaves-plugin

2669e4a86d72f2d8b67417812db8f52aa487f3de extracted windows-slaves code
to a separate plugin.
However in the process, it introduced a dependency conflict.
core -> j-interop -> jcifs (1.2.19)
whereas
windows-slaves-plugin -> ... -> jcifs (1.3.17-kohsuke-1)

This was causing NoSuchMethodError while launching windows slaves
Merge pull request #1106 from Vlatombe/fixing-windows-slaves-plugin

Fix windows-slaves-plugin
Merge pull request #1108 from kpfleming/no-executable-source

Remove unnecessary executable bits on source files
[JENKINS-21373] Noting.
FIXED JENKINS-10468 - Build Queue does not show the executor a build is
waiting for
Added null check suggested by Kohsuke
Merge pull request #1105 from damienfinck/master

Fix 2 bugs in translation tools + Improve French translations
[JENKINS-21474] Fix NPE in View.getComputers()
Merge pull request #1109 from olivergondza/JENKINS-21474

[JENKINS-21474] Fix NPE in View.getComputers()
Unify slave and label page appearance
Noting #1109
Follow-up on PR #1105: use != for numeric comparison

This is sort of a cosmetic change, the script also worked with string
comparison.
Noted windows-slaves-plugin split in 1.547

If it's significant enough to introduce regressions, it's significant enough for the changelog.
[FIXED JENKINS-21612] fixed wrong CSS class for f:combobox.
Merge pull request #1110 from ikedam/feature/JENKINS-21612_setting-input_for_combbox

[FIXED JENKINS-21612] fixed wrong CSS class for f:combobox.
Noting #1110