remove spurious trailing periods (https://github.com/gorhill/uMatrix/issues/30#issuecomment-361635820)

src/_locales/en/messages.json

@@ -380,7 +380,7 @@
         "description": "First part of 'Delete non-blocked session cookies [n] minutes after the last time they have been used'"
     },
     "privacyDeleteNonBlockedSessionCookiesPrompt2" : {
-        "message": " minutes after the last time they have been used.",
+        "message": " minutes after the last time they have been used",
         "description": "Second part of 'Delete non-blocked session cookies [n] minutes after the last time they have been used'"
     },
     "privacyDeleteNonBlockedSessionCookiesHelp" : {
@@ -400,7 +400,7 @@
         "description": "First part of 'Clear browser cache every [n] minutes'"
     },
     "privacyClearCachePrompt2" : {
-        "message": "minutes.",
+        "message": "minutes",
         "description": "Second part of 'Clear browser cache every [n] minutes'"
     },
     "privacyClearCacheHelp" : {
@@ -408,7 +408,7 @@
         "description": ""
     },
     "privacyProcessRefererPrompt" : {
-        "message": "Spoof <a href='https://en.wikipedia.org/wiki/HTTP_referer'>HTTP referrer</a> string of third-party requests.",
+        "message": "Spoof <a href='https://en.wikipedia.org/wiki/HTTP_referer'>HTTP referrer</a> string of third-party requests",
         "description": ""
     },
     "privacyProcessRefererHelp" : {
@@ -416,7 +416,7 @@
         "description": ""
     },
     "privacyNoMixedContentPrompt" : {
-        "message": "Strict HTTPS: forbid mixed content.",
+        "message": "Strict HTTPS: forbid mixed content",
         "description": ""
     },
     "privacyNoMixedContentHelp" : {
@@ -424,7 +424,7 @@
         "description": ""
     },
     "privacyProcessHyperlinkAuditingPrompt" : {
-        "message": "Block all <a href='https://html.spec.whatwg.org/multipage/semantics.html#hyperlink-auditing'>hyperlink auditing</a> attempts.",
+        "message": "Block all <a href='https://html.spec.whatwg.org/multipage/semantics.html#hyperlink-auditing'>hyperlink auditing</a> attempts",
         "description": ""
     },
     "privacyProcessHyperlinkAuditingHelp" : {
@@ -504,7 +504,7 @@
         "description": ""
     },
     "hostsFilesAutoUpdatePrompt":{
-        "message":"Auto-update assets.",
+        "message":"Auto-update assets",
         "description":""
     },
     "hostsFilesUpdateNow":{