Reword "replace by tabs/spaces" as "replace with"
Fix some conflicting mnemonics in the menus
Keep exact menu item string as keybinding label

Using the exact same string avoids duplicate translation, and here only
mnemonic changes were introduced with commit
95306ac8db4fc38ad7ba7e172328cef5117efaf0.
Update translations for recent mnemonic and wording fixes

There is no need to require the translators to review their translation
for these changes as the mnemonics and wordings are specific to the
language.  The update here will only save translators from having to
manually check and and remove the fuzzy marks from those strings.