removed default information from plugin.json files; move plugin descriptions...

removed default information from plugin.json files; move plugin descriptions to language files, where available

plugins/Contents/lang/en.json

 {
     "Contents":{
+        "PluginDescription": "Content and banner tracking lets you measure the performance (views, clicks, CTR) of any piece of content on your pages (Banner ad, image, any item).",
         "Impressions":"Impressions",
         "Interactions":"Interactions",
         "Interaction":"Interaction",

plugins/Contents/plugin.json

-{
- "name": "Contents",
- "version": "0.1.0",
- "description": "Content and banner tracking lets you measure the performance (views, clicks, CTR) of any piece of content on your pages (Banner ad, image, any item).",
- "theme": false,
- "authors": [
-     {
-         "name": "Piwik",
-         "email": "",
-         "homepage": ""
-     }
- ]
-}
\ No newline at end of file

plugins/DevicesDetection/plugin.json

 {
-  "name": "DevicesDetection",
-  "version": "1.14",
   "authors": [
     {
       "name": "Piwik PRO",

plugins/Ecommerce/lang/en.json

 {
     "Ecommerce": {
+        "PluginDescription": "Ecommerce lets you track when users add products to carts, and when they convert to a ecommerce sale. Also track products and product categories views and abandoned carts.",
         "Sales": "Sales",
         "ViewSalesBy": "View sales by %s"
     }

plugins/Ecommerce/plugin.json

-{
-    "description": "Ecommerce lets you track when users add products to carts, and when they convert to a ecommerce sale. Also track products and product categories views and abandoned carts. "
-}
\ No newline at end of file

plugins/Events/lang/en.json

 {
     "Events": {
+        "PluginDescription": "Track Events and get reports on your visitors activity.",
         "AvgEventValue": "Average Event value is: %s",
         "AvgValue": "Average value",
         "AvgValueDocumentation": "The average of all values for this event",

plugins/Events/plugin.json

-{
- "name": "Events",
- "version": "1.0",
- "description": "Track Events and get reports on your visitors activity. ",
- "theme": false
-}
\ No newline at end of file

plugins/Insights/lang/en.json

 {
     "Insights": {
+        "PluginDescription": "Provides Insights about your traffic. Insights are available as dashboard widgets as well as a new icon in reports to let you see most important trends in your data.",
         "ControlComparedToDescription": "Growth compared to the",
         "ControlFilterByDescription": "Show all, only movers, only new or only disappeared",
         "DatePeriodCombinationNotSupported": "It is not possible to generate insights for this date and period combination.",

plugins/Insights/plugin.json

-{
- "name": "Insights",
- "version": "0.1.0",
- "description": "Provides Insights about your traffic. Insights are available as dashboard widgets as well as a new icon in reports to let you see most important trends in your data.",
- "theme": false,
- "license": "GPL v3+",
- "homepage": "http://piwik.org",
- "authors": [
-     {
-         "name": "Piwik",
-         "email": "hello@piwik.org",
-         "homepage": "http://piwik.org"
-     }
- ]
-}
\ No newline at end of file

plugins/LeftMenu/lang/en.json

 {
     "LeftMenu": {
+        "PluginDescription": "Position the dashboard menu to the left.",
         "SettingsIntroduction": "The left menu plugin will move the reporting menu from the top to the left if enabled. This is especially useful for large displays.",
         "GlobalSettingTitle": "Left menu enabled by default",
         "GlobalSettingDescription": "Defines the system default for all of your users.",

plugins/LeftMenu/plugin.json

-{
-    "description": "Position the dashboard menu to the left. ",
-    "theme": false
-}
\ No newline at end of file

plugins/MultiSites/plugin.json

 {
-  "name": "MultiSites",
   "authors": [
     {
       "name": "Piwik PRO",

plugins/Overlay/plugin.json

-{
-    "name": "Overlay"
-}
\ No newline at end of file

plugins/Proxy/plugin.json

 {
-    "name": "Proxy",
     "description": "Proxy services"
 }
\ No newline at end of file

plugins/SEO/lang/en.json

 {
     "SEO": {
+        "PluginDescription": "This Plugin extracts and displays SEO metrics: Alexa web ranking, Google Pagerank, number of Indexed pages and backlinks of the currently selected website.",
         "AlexaRank": "Alexa Rank",
         "Bing_IndexedPages": "Bing indexed pages",
         "Dmoz": "DMOZ entries",

plugins/SEO/plugin.json

-{
-  "name": "SEO",
-  "description": "This Plugin extracts and displays SEO metrics: Alexa web ranking, Google Pagerank, number of Indexed pages and backlinks of the currently selected website."
-}

plugins/SegmentEditor/lang/en.json

 {
     "SegmentEditor": {
+        "PluginDescription": "Create and reuse custom visitor Segments with the Segment Editor.",
         "AddANDorORCondition": "Add %s condition",
         "AddNewSegment": "Add new segment",
         "AreYouSureDeleteSegment": "Are you sure you want to delete this segment?",

plugins/SegmentEditor/plugin.json

-{
-  "name": "SegmentEditor",
-  "description": "Create and reuse custom visitor Segments with the Segment Editor."
-}

plugins/UserCountryMap/lang/en.json

 {
     "UserCountryMap": {
+        "PluginDescription": "This plugin provides the widgets Visitor Map and Real-time Map. Note: Requires the UserCountry plugin enabled.",
         "AndNOthers": "and %s others",
         "Cities": "Cities",
         "Countries": "Countries",

plugins/UserCountryMap/plugin.json

-{
-    "name": "User Country Map",
-    "description": "This plugin provides the widgets Visitor Map and Real-time Map. Note: Requires the UserCountry plugin enabled."
-}