Version 3.9.91
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 * Build system fixes (Seán de Búrca)
 * Miscellaneous fixes and cleanups (Jiro Matsuzawa, Felix Riemann)

Bug fixes:

 #706837, build fails due to missing IT_PROG_INTLTOOL macro (Seán de Búrca)
 #707099, build fails due to extraneous command in autogen (Seán de Búrca)
 #707212, Mnemonics conflict in delete-confirmation dialog. (Jiro Matsuzawa)

New and updated translations:

- Ryan Lortie, Tiffany Antopolski [eo]
- Daniel Mustieles [es]
- Alexandre Franke [fr]
- Seán de Búrca [ga]
- Fran Dieguez [gl]
- Andika Triwidada [id]
- Aurimas Černius [lt]
- Piotr Drąg [pl]
- Matej Urbančič [sl]
- Victor Ibragimov [tg]

New and updated manual translations

- Gabor Kelemen [hu]