new locale
only create hyperlinks for email addresses if not already an url

fixes https://wiki.openstreetmap.org/wiki/Talk:Overpass_turbo#Broken_Links_in_Popup_for_URLs_in_Key_Values
add new translation: Spanish

thanks @51114u9 :)
update translations
update translations
fix html vadidation errors

* use custom `data-t` attribute for translations instead of `t`
* add img alt texts where appropriate
* fix a paragraph extending over the next block element
addendum
upgrade libraries: leaflet 0.7 and lodash 2.3
activate tile overscaling for easier inspection of small features
fix bug where automatic zoom to data was also activated on manual query execution
rework header structure, better css styling
remove bogus max-device-width

was added in 04a354208d6308f3ecc2281bf6e1e227d9871d36, but can't
remember why. And now it's only causing troubles with iPads.
Merge branch 'master' into ffs

Conflicts:
	index.html
	index_packaged.html