Additions

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- Spellchecking: Can be activated by defining a language in BADWOLF_L10N
- Permission-Requests: They are disabled by default (going to be changed later
to a per-host policy à la µmatrix)
- Keybinds: Alt-d can also close the tab
- Keybinds: Alt-n (where n is [0-9]) to quickly switch to a tab
- Add support for downloading files to a specific location (currently lacks
progress notification/display), it is the default behaviour when the MIME type
isn't supported.

Changes
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- Interface: Synchronise the menu-label of a tab with it's title
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