Fix form buttons and general language issues

mutalyzer/website/templates/batch-jobs.html

mutalyzer/website/templates/description-extractor.html

mutalyzer/website/templates/homepage.html

mutalyzer/website/templates/name-checker.html

mutalyzer/website/templates/name-generator.html

mutalyzer/website/templates/position-converter.html

mutalyzer/website/templates/reference-loader.html

mutalyzer/website/templates/snp-converter.html

mutalyzer/website/templates/static/js/generator.js

mutalyzer/website/templates/syntax-checker.html

tests/test_website.py