add overwrite option on extension upload form

By default, on frontend $overwrite is false. Backend function installFromUpload
/ installFromURL will have a default of true to preserve existing behavi

add overwrite option on extension upload form

By default, on frontend $overwrite is false. Backend function installFromUpload
/ installFromURL will have a default of true to preserve existing behavior for
other API users.

installArchive now will insert a frontend msg() about not installing because of
overwrite restriction. It's not being exposed by exception, but it should be
reflected on its return array list of installed plugin.

This fixes #715.

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Update de, de-informal

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Add files via upload (#2679)

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Merge pull request #2577 from chang-zhao/patch-5

Add links "plugins" & "templates" to intro_search.txt

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translation update for zh:extensions, revert "offline" to "manual"

translation update for zh:extensions, closes #2572

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