Merge pull request #394 from diox/use-fireplace-specific-search-api-endpoint

Use Fireplace-specific search API endpoint (bug 982992)
ensure that hidden screenshot thumbnails are never loaded (bug 983346)
Merge pull request #397 from cvan/potatohoudini

ensure that hidden screenshot thumbnails are never loaded (bug 983346)
new splash screen; use minified splash-screen stylesheet (bug 966051, bug 965925)
use vendor prefixes for old flexbox for iOS/Safari WebKit (bug 966051)
load image when visible on detail page (bug 983346)
bold things by default
do not use background-size shorthand for incompatibility banner (does not work in iOS WebKit)
Move these translations to a single-line to prevent extraction issues