update of English (US) language files to match German files

This commit introduces the language file changes that were made for
the German files as part of commit 232eb5eddf.
next update of English (US) language files to match German files

This commit introduces the language file changes that were made for
the German files as part of commit d1b3f0e2fe.
It also fixes a previously untranslated line.
simplify a PDO query

(We do not need a prepared statement here, because there are no input
 variables in the statement that are "escaped" by using one.)
Merge pull request #92 from Thoronador/feature-language-en_US

another update of the English (US) language files to match current German files