fix ref #6743 missing l10n for specimen editor context menu
ref #6527: change the labels for media deletion config and remove undeletable media from gallery
minor
ref #6566 Removed unused classes and properties
ref #6566 Remove unused dynamic context menu + l10n
Remove unused NLS string
ref #4993: adapt deleteDerivateHandler and Operation
Fix typo
ref #4611 Fix Messages.java bundle path
ref #4611 Remove unused string constant
ref #4611 complete i18n for taxeditor.editor plugin