v1.6.1 release

• Advanced options: delay modifying files on FAT partition until config.txt is visible.
• Advanced options: search all mount points for FAT partition.
• Mac OS X: use alternative method to detect preferred language.
• Update translations.
• Linux: revert "disable high dpi scaling on incorrect EDID" due to it causing the custom file selection dialog not to function properly on Fedora.
• Linux: when writing .zip files with multiple files, delay extracting .zip after mounting FAT32 if necessary. Workaround for when Imager is run in a sandboxed environment in which udisks2 running on the host system reports the mount completed, but it is not there yet in the sandbox.
• Advanced options: if user configured they want to use SSH, but forget to enter password, highlight "password" label red to draw attention to that, instead of just refusing to save settings.