Pontoon: Update English (en) localization of Cassandra GLAM tools

Co-authored-by: alemela <alemela@synapta.it>

app/locales/en/metabase.ini

@@ -1,5 +1,5 @@
 views=Views
-upload=Upload
+upload=Uploads
 top=Top
 usage=Usage
 corr=Correlations
@@ -11,7 +11,7 @@ corr-old-desc=From -1 to 1. This number represents the correlation between numbe
 corr-old=Correlation views / oldness
 uploaded-last-desc=Percentage of new media uploaded last year (rolling).
 uploaded-last=Uploaded last year increment
-perc-used-desc=Percentage of media used to enrich Wikimedia pages.
+perc-used-desc=Percentage of distinct media used to enrich Wikimedia pages. (Remember: a media may illustrate more than one page)
 perc-used=Media used
 views-change-desc=Percentage of last year's views compared to the previous one.
 views-change=Views change last year
@@ -25,21 +25,23 @@ media=Media
 usage-count=Distinct usage count
 top-views-desc=List of the top 5 most viewed media in the last year. To see media details, copy its name and paste in a URL like: /<glam-id>/file/<media-name>, for example: /ZU/file/Rennwegtor.jpg
 top-views=Top 5 media by views last year
-enanched-desc=Sum of all Wikimedia pages (in all languages) with at least one media inside.
-enanched=Total pages enanched
-total-views-desc=Sum of all media views from 2015-01-01 (first data available). A view is recorded every time a device download a specific file from Wikimedia server. So it counts both punctual views, both views on pages where the media is present (but only if loaded on the device). Actually this is the most precise statistic released by Wikimedia servers.
-total-views=Total views from 2015
-total-media-desc=The number of all media tracked in the project.
+enanched-desc=Sum of all Wikimedia pages (in all languages) with at least one media of the categories illustrated in a Wikipedia article.
+enanched=Total pages enhanced
+total-views-desc=Sum of all media views from 2015-01-01 (first data available). A view is recorded every time a device open a specific file from Wikimedia server. So it counts both punctual views to the files, both views on pages where the media is present. Actually this is the most precise statistic released by Wikimedia servers (for more information visit https://pageviews.toolforge.org/faq/)
+total-views=Total views from 2015 until today
+total-media-desc=Total number of all media uploaded to Wikimedia Commons and tracked in this project.
 total-media=Total media uploaded
-views-year-desc=Number of views per year, in purple cumulative visits, in blue year per year visits. Data starts from the oldest date in our system (the raw data starts from 2015).
-views-year=Media views per year
+views-year-desc=Number of views per year. Cumulative views in purple and total of views per year in blue. The raw data starts in 2015 from Baglama, having a different statistical calculation method. The switch in a more sophisticated method starts when the first data set was recorded within the GLAM statistical tool, 
+basically at the time, when the GLAM account was created. 
+views-year=Media views
 visits-per-year=Visits per year
-cumulative-usage=Cumulative usage
+cumulative-usage=Cumulative
 media-used-desc=Media used to enrich Wikimedia pages. In blue year per year addition (the peak in the first year is because no historical data were available before we start to collect it). In purple cumulative usage.
-media-used-year=Media used per year
+media-used-year=Media used
 new-usages=New usages
-media-added-desc=Track record of uploads. In blue year by year the number of new media uploaded. In purple the same but cumulative.
-media-added=Media added per year
-media-per-year=Media per year
-media-cumulated=Media cumulated
+media-added-desc=Track record of uploads. Total number of yearly new media uploads in blue. 
+Cumulative media uploads in purple.
+media-added=Media Uploads
+media-per-year=Uploads per year
+media-cumulated=Uploads cumulated
 year=Year