fix: Improve installation and settings UX

[matellush]

Purpose of this PR:

Fix all annoying, long-standing, but easy-to-fix bugs users have had to deal with related to setting up Wheel Wizard, especially on Linux.

How to Test:

Test both unsandboxed and sandboxed (Flatpak) versions of Wheel Wizard and check whether the initial setup works without issues (also, for example, if multiple branches exist for Dolphin Flatpak). Test whether the Dolphin Flatpak installation works without privileges. Ensure that the file pop-up is not shown anymore for Flatpak Wheel Wizard since it does not make any sense. Check whether Wheel Wizard correctly identifies a native Dolphin installation on Linux. Also check whether the fixed newlines are displayed correctly in other environments.

What Has Been Changed:

• The Dolphin Flatpak detection has been fixed to use flatpak list rather than flatpak info which failed if more than one branch existed with a Dolphin installation. We do not care about installation branches.
• Translations have been updated to account for the fact that Flatpak Dolphin is not installed system-wide anymore, but per-user. For this, the official Dolphin Flatpak remote is added to the user configuration and then used to install Dolphin without any admin privs. Also, the flathub user remote is added if it did not already exist.
• The Wheel Wizard Flatpak will also get the Dolphin Flatpak installation pop-up now that it is an unprivileged per-user installation which we can perform due to having to escape the sandbox already.
• The Wheel Wizard Flatpak will not display the file picker pop-up anymore for the Dolphin executable since it cannot work.
• The detection for whether or not dolphin-emu is installed on Linux with sandboxed Wheel Wizard has been fixed to test running the host command dolphin-emu --version (the command is always available in the Wheel Wizard Flatpak's environment).
• The settings validation was fixed to allow Flatpak Dolphin file paths even if Wheel Wizard does not recognize, for example, the app ID of Dolphin.
• The checks for IsFlatpakDolphinFilePath have been fixed to not depend on additional queries to PathManager to avoid inconsistencies with the used dolphin location in the different code paths.
• The English translation has received new text for the detected Dolphin executable for Wheel Wizard on Linux (has to be translated to other languages still, but should be similar to the folder pop-up; I was too lazy to do this).
• Translations were fixed to correctly display newlines with the correct YAML syntax.
• The app ID for the Flatpak permissions fixing is determined using regex matching based on the Dolphin command that was configured, which should work for most use cases and enable using Dolphin builds with different app IDs.

Related Issue Link:

#185

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• You have created relevant tests

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[matellush]

It should also work now even if no Flatpak remote was configured at all -- Wheel Wizard will also add the flathub user remote if it did not exist already.