Bug 912055: Update basket-client
Bug 912055: Support invalid email errors from basket.
Bug 973657 - Tabzilla MWC promo for "ja" and "el"

Fix font size for “el” and “ja”
Bug 974803 - MWC Partners page: fix el, zh-TW

el: title overlapping with Firefox logo
zh-TW: text covered by Firefox’s tail in Marketplace section
cs, el, ja, pl, ro, sr: fix #explore arrow (cur or overlap)
Merge pull request #1727 from flodolo/bug973657_ja_el

Bug 973657 - Fix CSS in tabzilla MWC promo for "ja" and "el"
Port /press/speakerrequest/ to bedrock. Bug 940555.
Merge pull request #1726 from flodolo/bug974803_el_zhTW

Bug 974803 - MWC Partners page: improve display for locales
Bug 973657 - [hu] Improve MWC Promo in Tabzilla
Merge pull request #1731 from flodolo/bug973657_tabzilla_hu

Bug 973657 - [hu] Improve MWC Promo in Tabzilla
Use window shortcut, update quote type
Merge pull request #1639 from jpetto/bug-940555-port-speaker-request-to-bedrock

Port /press/speakerrequest/ to bedrock. Bug 940555.
Merge pull request #1590 from pmclanahan/validate-email-addresses-912055

Bug 912055: Support invalid email errors from basket.
Merge pull request #1732 from darkwing/modal-cleanup

Use window shortcut, update quote type