Lute v3

Fixes:

• #685: fix random/bad images in term image search. By ignacio and @marcomachado in #691
• #608: fix encoding issue when importing some epubs. By @sakolkar in #617
• #630: add “mimetype” to css links to ensure layout works. By @VeryUsual in #671
• Fix audio player visibility in Night theme. By @p-value-sharma in #665
• Fix URL import encoding for pages without charset in HTTP header. By @vikarag in #660

Feature changes:

• New Dusk theme. By @schlick7 in #658
• #655: move cursor to the term input field for new terms. By @swayam-rajput in #662
• #668: add simple reading streak. By @VeryUsual in #676
• Allow .m4b audio files. By @MilanTodorovic in #684

Code tweaks:

• #331: refactor javascript to manage language dictionaries as structs. By @goodolcuppa in #638
• Remove duplicate code for audio file formats. By @marcomachado in #690

Language tweaks (PR numbers refer to the lute-language-defs repo, https://github.com/LuteOrg/lute-language-defs):

• Add Toki Pona. By @lacorrep in #11
• Add Cebuano. By @bemitc in #10
• Update Belarusian word_chars to include Ёё. By @PlagaMedicum in #14
• Add more embedded URLs for Belarusian terms in definition.yaml. By @PlagaMedicum in #12
• Update Dutch and Spanish dictionaries. By @evolving-dev in #8
• Add google translate for Tibetan. By @tomer-gom in #7
• Change Mandarin default dictionary from yabla to MDBG. By @DorusKeijzer in #654