Merge pull request #229 from diethard2/manual_en_v2.2

removed old Dutch screenshots from 1.7.3
Moving the tx step to html, making it easier to build translated html only
from transifex changed files
new files from tx
Merge branch 'manual_en_v2.2' of github.com:qgis/QGIS-Documentation into manual_en_v2.2
ignoring i18n to make it easier to use cron
making it easier to docker build one language
fix
really fix the docker_world.sh
docker fix
updated from tx after build
make mulitlingual building with paver possible
update readme for transifex instructions
Update readme.rst
Merge pull request #232 from cdavila/patch-1

Update Spanish team info
fix for i18n build
Update readme.rst
Merge pull request #237 from egonzale/manual_en_v2.2

Update readme.rst
po files after build
spanish screenshots for training manual

modules 1-13 covered, some screenshots missing will be corrected for
next version