Release for version 0.7

• Updated "README.md" file and "README" files including changelog of previous versions.
• Added French translations.
• Updated language header files.
• Updated version information.

Compiled by GCC 9.3.0 on DJGPP.

Release for version 0.6

• Updated language strings.
• Converted forgotten files with LF line ending at CR/LF line ending.
• Updated Makefile and delete binaries from sources.
• Updated documentation.
• Update .gitignore file.