No need to make FAQ link translatable

(closes #2973)

data/core.yaml

@@ -274,7 +274,6 @@ en:
     custom_prompt: "Enter a tile URL template. Valid tokens are {z}, {x}, {y} for Z/X/Y scheme and {u} for quadtile scheme."
     fix_misalignment: Fix alignment
     imagery_source_faq: Where does this imagery come from?
-    imagery_source_faq_link: https://github.com/openstreetmap/iD/blob/master/FAQ.md#how-can-i-report-an-issue-with-background-imagery
     reset: reset
     minimap:
       description: Minimap

dist/locales/en.json

@@ -330,7 +330,6 @@
         "custom_prompt": "Enter a tile URL template. Valid tokens are {z}, {x}, {y} for Z/X/Y scheme and {u} for quadtile scheme.",
         "fix_misalignment": "Fix alignment",
         "imagery_source_faq": "Where does this imagery come from?",
-        "imagery_source_faq_link": "https://github.com/openstreetmap/iD/blob/master/FAQ.md#how-can-i-report-an-issue-with-background-imagery",
         "reset": "reset",
         "minimap": {
             "description": "Minimap",

js/id/ui/background.js

@@ -269,7 +269,7 @@ iD.ui.Background = function(context) {
           .attr('target', '_blank')
           .attr('tabindex', -1)
           .call(iD.svg.Icon('#icon-out-link', 'inline'))
-          .attr('href', t('background.imagery_source_faq_link'))
+          .attr('href', 'https://github.com/openstreetmap/iD/blob/master/FAQ.md#how-can-i-report-an-issue-with-background-imagery')
           .append('span')
           .text(t('background.imagery_source_faq'));