cleaned up translation files
fixed duplicate array in en.php
Fixes #343
Merge pull request #347 from kevinpapst/translations/cleanup

Cleaned up translation files
moved files to new repository:
https://github.com/kimai/manuals
added documentation links
Merge pull request #348 from kevinpapst/documentation

Documentation
new estonian translation, kudos to andres99
Merge pull request #354 from kevinpapst/language-et

new estonian translation
added composer.json
Merge pull request #357 from kevinpapst/updateinfo

added composer.json
fixes #277 #349
Merge pull request #358 from kevinpapst/fixes/349

Fixes #277 #349
unset variables that should not be in the invoice template
map customer array to old ODT variable names
invoice templates
Merge pull request #359 from kevinpapst/invoices

Invoice improvements