Updated German and Czech language files.
Merge pull request #1363 from normanjaeckel/Languages

Updated German and Czech language files.
Fixed #1354: Added CKEditor plugin insterpre to README.
Added version numbers of required packages to portable build instruction.
Updated FR translation.
Merge pull request #1365 from emanuelschuetze/fix-1354

Fixed #1354: Added CKEditor plugin insterpre to README.
Merge pull request #1366 from emanuelschuetze/portable-readme

Added version numbers of required packages to portable build instruction...
Merge pull request #1367 from emanuelschuetze/fr-translation

Updated FR translation.