Same holds true for cache files, so there should be no problem anymore with installs where the static folder is not writable.
Also introduced two new devel config vars to disable merging and minifying of the assets, solved the empty-less-bundle problem and made sure babel knows about the jinja extension.
Also included is a translation for (informal) german.
New languages can be added with "python setup.py babel_new --locale=<language code>" which will create the corresponding .po file from the existing .pot file under "src/octoprint/translations/<language code>". Translations can be refreshed from strings in source with "python setup.py babel_refresh". Existing translations can be compiled into usable translation files (.mo for python and .js for Javascript) via "python setup.py babel_compile".
You'll need to install the development dependencies for all of this to work, just issue "pip install -r requirements-dev.txt"
Note: numbers are not yet correctly formatted for their respective locale (e.g. "2.5mm" instead of "2,5mm" in german).
