add venv and URI encode video play links

.gitignore

@@ -2,3 +2,4 @@ instance/*
 __pycache__/
 tags
 *.swp
+venv/

video_metadata/static/file_listing.js

@@ -70,7 +70,7 @@ function openInfoCard(dataset, element) {
 			// NOTE: add play link
 			let a = document.createElement('a');
 			a.classList.add('play_link');
-			a.href = VIDEO_PREFIX + dataset.rel_path;
+			a.href = encodeURI(VIDEO_PREFIX + dataset.rel_path);
 			a.appendChild(document.createTextNode('play'));
 			let div = blurb.querySelector('.search_result');
 			div.insertBefore(a, div.firstChild);