Remove triple braces for i18n blocks in 404 and anno edit templates

The intent of the triple braces was to prevent escaping, but
handlebars-i18next already disables escaping. After a `gulp clean` I
found out that gulp-handlebars was actually tripping over this
notation.

Author: jgonggrijp

frontend/src/i18n/en/translation.json

@@ -74,15 +74,15 @@
   "feedback-tooltip": "Give us feedback on the interface",
   "log_out": "Log out",
   "not_found_alt": "404 Not Found",
-  "not_found_text": "}\n    Oops, this page doesn't seem to exist.\n    You can <a onclick=\"history.back()\">go back</a>,\n    visit <a href=\"/landing\">Landing</a> or <a href=\"/search\">Search</a>,\n    or report a problem to the maintainers.\n{",
+  "not_found_text": "Oops, this page doesn't seem to exist.\n    You can <a onclick=\"history.back()\">go back</a>,\n    visit <a href=\"/landing\">Landing</a> or <a href=\"/search\">Search</a>,\n    or report a problem to the maintainers.",
   "pagination": "pagination",
   "to_first_page": "Go to page 1",
   "to_last_page": "Go to last page",
   "annotations_title": "Annotations",
   "filter": "Filter",
   "export_annotations": "Export annotations",
   "edit_annotation": "Edit Annotation",
-  "annotation_info": "}(Find more info on what and how to annotate in\n            <a class=\"is-link\" href=\"http://dhstatic.hum.uu.nl/readit/AnnotationGuide.pdf\" target=\"_blank\"> the\n                Annotation Guide</a>{",
+  "annotation_info": "(Find more info on what and how to annotate in\n            <a class=\"is-link\" href=\"http://dhstatic.hum.uu.nl/readit/AnnotationGuide.pdf\" target=\"_blank\"> the\n                Annotation Guide</a>",
   "title_category": "Category",
   "category_choice": "Choose a category before saving.",
   "needs_verification": "Needs verification",

frontend/src/i18n/fr/translation.json

@@ -74,15 +74,15 @@
   "feedback-tooltip": "Give us feedback on the interface",
   "log_out": "Log out",
   "not_found_alt": "404 Not Found",
-  "not_found_text": "}\n    Oops, this page doesn't seem to exist.\n    You can <a onclick=\"history.back()\">go back</a>,\n    visit <a href=\"/landing\">Landing</a> or <a href=\"/search\">Search</a>,\n    or report a problem to the maintainers.\n{",
+  "not_found_text": "Oops, this page doesn't seem to exist.\n    You can <a onclick=\"history.back()\">go back</a>,\n    visit <a href=\"/landing\">Landing</a> or <a href=\"/search\">Search</a>,\n    or report a problem to the maintainers.",
   "pagination": "pagination",
   "to_first_page": "Go to page 1",
   "to_last_page": "Go to last page",
   "annotations_title": "Annotations",
   "filter": "Filter",
   "export_annotations": "Export annotations",
   "edit_annotation": "Edit Annotation",
-  "annotation_info": "}(Find more info on what and how to annotate in\n            <a class=\"is-link\" href=\"http://dhstatic.hum.uu.nl/readit/AnnotationGuide.pdf\" target=\"_blank\"> the\n                Annotation Guide</a>{",
+  "annotation_info": "(Find more info on what and how to annotate in\n            <a class=\"is-link\" href=\"http://dhstatic.hum.uu.nl/readit/AnnotationGuide.pdf\" target=\"_blank\"> the\n                Annotation Guide</a>",
   "title_category": "Category",
   "category_choice": "Choose a category before saving.",
   "needs_verification": "Needs verification",

frontend/src/notfound404/notfound-template.hbs

@@ -4,9 +4,9 @@
         alt="{{#i18n 'not_found_alt'}}404 Not Found{{/i18n}}"
     >
 </figure>
-<p>{{{#i18n 'not_found_text'}}}
+<p>{{#i18n 'not_found_text'}}
     Oops, this page doesn't seem to exist.
     You can <a onclick="history.back()">go back</a>,
     visit <a href="/landing">Landing</a> or <a href="/search">Search</a>,
     or report a problem to the maintainers.
-{{{/i18n}}}</p>
+{{/i18n}}</p>

frontend/src/panel-annotation/annotation-edit-template.hbs

@@ -1,9 +1,9 @@
 <div class="panel-header">
     <header>
         <p class="title is-3">{{#i18n 'edit_annotation'}}Edit Annotation{{/i18n}}</p>
-        <p class="subtitle is-7">{{{#i18n 'annotation_info'}}}(Find more info on what and how to annotate in
+        <p class="subtitle is-7">{{#i18n 'annotation_info'}}(Find more info on what and how to annotate in
             <a class="is-link" href="http://dhstatic.hum.uu.nl/readit/AnnotationGuide.pdf" target="_blank"> the
-                Annotation Guide</a>{{{/i18n}}})
+                Annotation Guide</a>{{/i18n}})
         </p>
     </header>
 </div>