Remove, and replace, OS-promoting text

[David Hedlund]

ISSUE 1 - "To try or install [OS]"

Issue text "To try or install [OS] from a removable disk, it needs to be set up as a startup disk."
Solution: Replace the issue text with: "Select the .iso file and the removable device that you want the system to be installed to:"

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ISSUE 2 - "You may now run [OS]"

Steps to reproduce
* In Ubuntu, start usb-creator-gtk. Add trisquel_11.0_amd64.iso (download from https://trisquel.info/en/download)
* In Trisquel, start usb-creator-gtk. Add ubuntu-23.04-desktop-amd64.iso

* Click on the "Make Startup Disk" button.
* When the installation is complete, an "Installation is complete" dialogue box pop-up with the text:

* In Ubuntu: "You may now run Ubuntu on other computers by booting them with this drive inserted."
* In Trisquel: "You may now run Trisquel on other computers by booting them with this drive inserted."

Issue: "You may now run [OS]" is incorrect. See https://gitlab.trisquel.org/trisquel/package-helpers/-/issues/68 for screenshots

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Solution 1 - Reuse "OS Version"

"You may now run [OS Version] on other computers by booting them with this drive inserted.".

"OS Version" is set to "Trisquel 11 "aramo" - Release amd64 (20230315)" in the screenshot https://gitlab.trisquel.org/trisquel/package-helpers/uploads/4d27c4506a048e451bcda35d8634eea1/finish2.png

So the text would be:
"Trisquel 11 "aramo" - Release amd64 (20230315) has been installed on the drive, which you now can insert and boot on other computers." -- but it might be difficult to retrieve the title "Trisquel Mini" from the ISO?

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Solution 2 - plain text

    "You may now run you system on another computer"

However, this may lead you clueless what has been installed since the usb-creator-gtk window has been closed, so there's no way to identify the file name.

This solution can be implemented and later be replaced by solution 1.

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ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: usb-creator-gtk 0.3.16
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 20 14:06:53 2023
InstallationDate: Installed on 2023-07-23 (58 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: usb-creator
UpgradeStatus: No upgrade log present (probably fresh install)