Adds german translations.

[AVGP]

refs #56

[kelson42]

@AVGP Thx for the PR!

[dattaz]

Hello,
Thanks a lot for you PR !
Can you add initialization for german please ? (see https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/templates/l10n/locales.ini and also here https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/export.py#L40 )

[AVGP]

@dattaz done

[dattaz]

Thanks 👍 🎆

[dattaz]

@AVGP Hi, we found with your PR that we have 2 system for translations, I am unifying them, but i'm missing some german strings, can you give me them by comment here ? Thanks.

"Interface language" : (https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/l10n.py#L26)
"List books of a single Author" : ( https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/l10n.py#L33 )
"Choose the Catalog" : ( https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/l10n.py#L79 )
"Main languages" : ( https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/l10n.py#L82 )
"Other languages" : ( https://github.com/openzim/gutenberg/blob/master/gutenbergtozim/l10n.py#L85 )

[kelson42]

@dattaz done c663232