Add a "find and replace as suggestion" batch action

[bugzilla-to-github]

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Bug 1324411

Bug Reporter: @Fjoerfoks CC: @mathjazz See also: https://bugzilla.mozilla.org/show_bug.cgi?id=1386267

When you select multiple strings which are marked as suggested, the submenu on the right appears in which you can Approve All/Delete All, but also Replace all. Very useful, but it is only possible to Replace all with a green button. If you click on Replace all, the strings are being replaced (cool!), but also marked as Approved. What would be useful is the option to do a Replace all, but mark them (or keep them marked) as Suggested.