Bug 893165: Turn off specialness of newsletter span

In the headline on the /newsletter page, turn off the special styling
of the span tag. We'd rather just remove the span tag from the text,
but that would invalidate all the existing translations.
Bug 892696: Point all locales to bedrock for /newsletter/.

Also fix some l10n issues with _lazy and error messages.
Merge pull request #1062 from pmclanahan/enable-locales-newsletter-892696
Merge pull request #1089 from dpoirier/bug-893165-neutralize-span

Bug 893165: Turn off specialness of newsletter span
Revert "Fix bug 893187 - Add Optimizely code snippet to mozilla.org homepage"

We still need to whitelist optimizely in the x-frame-options header.

This reverts commit e5c178a9bd0cc3fa72e5bf6a0da29782e15a0eb9.
Bug 895317 remove /en-US/ from support.mozilla.org links
Merge pull request #1090 from retornam/bug-895317-fixfirefoxos-sumo

Bug 895317 remove /en-US/ from support.mozilla.org links
Bug 894055: Add funnelcake parameter to bedrock URLs.

Now if a page has a download button on it, and the
url includes the query param `f=[0..9999]`, then that
number will end up on download links in the form
`product=firefox-stub-f999`. The ID must be numeric
and not exceed 4 digits.
Merge pull request #1092 from pmclanahan/enable-funnelcake-qs-param-894055

Bug 894055: Add funnelcake parameter to bedrock URLs.
Bug 896260 - Localize home page <title>
Merge pull request #1094 from TheoChevalier/localize-home-title

Bug 896260 - Localize home page <title>