Update English translation

Make the terminology more consistent.
Merge remote-tracking branch 'upstream/master' into i18n_english
Update robopaint.en-US.json
Update robopaint.en-US.json
Update file

correct painting to drawing
Merge pull request #175 from docprofsky/i18n_english

Update English translation terminology
Merge remote-tracking branch 'upstream/master' into i18n

Conflicts:
	resources/i18n/robopaint.en-US.json