atril 1.23.0 release

Changes since the last release: v1.22.1...v1.23.0

atril 1.23.0

• update translations
• Remove trailing whitespaces
• test: get focus on frame
• let test7.py can works
• force get focus on atril when testing
• migrate to python3 for test cases
• Bump Cairo version to 1.14.0
• Change url project's website
• [ci] Add cppcheck html report
• [ci] Enable Clang Static Analyzer
• help: update copyright
• Add documenters to translation resource
• Use program-name and title in gtk_show_about_dialog call
• Update copyright in about dialog
• Use g_strjoin to build license text in about dialog