gui: Allow to translate and fix incorrect Versions date filter ranges (#8162)

* gui: Allow to translate and fix incorrect Versions date filter ranges

Translate the previously English-only ranges used in Versions date
filter. In the process, fix the currently incorrect range calculation.

For instance, let us say it is 08:05. Selecting "today" should set the
range to start at 00:00 and end at 08:05. However, what really happens
is that both start and end are set to 08:05, and as a result "today" is
never shown to the user. The case is the same for "yesterday", which in
contrary to "today" is shown, but its range is fixed at 08:05 on the
previous day.

This commit fixes the above by always calculating "today" starting at
00:00 up to the current moment, and calculating "yesterday" from 00:00
on the previous to 00:00 on the current day.

When it comes to "last x days", the commit fixes the calculation so that
it actually covers the whole day, which is done by moving the start date
to 00:00 on the first day.

Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>

gui/default/assets/lang/lang-en.json

@@ -19,6 +19,7 @@
    "Advanced": "Advanced",
    "Advanced Configuration": "Advanced Configuration",
    "All Data": "All Data",
+   "All Time": "All Time",
    "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.": "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.",
    "Allow Anonymous Usage Reporting?": "Allow Anonymous Usage Reporting?",
    "Allowed Networks": "Allowed Networks",
@@ -66,6 +67,7 @@
    "Copyright © 2014-2019 the following Contributors:": "Copyright © 2014-2019 the following Contributors:",
    "Creating ignore patterns, overwriting an existing file at {%path%}.": "Creating ignore patterns, overwriting an existing file at {{path}}.",
    "Currently Shared With Devices": "Currently Shared With Devices",
+   "Custom Range": "Custom Range",
    "Danger!": "Danger!",
    "Debugging Facilities": "Debugging Facilities",
    "Default Configuration": "Default Configuration",
@@ -183,6 +185,9 @@
    "Keep Versions": "Keep Versions",
    "LDAP": "LDAP",
    "Largest First": "Largest First",
+   "Last 30 Days": "Last 30 Days",
+   "Last 7 Days": "Last 7 Days",
+   "Last Month": "Last Month",
    "Last Scan": "Last Scan",
    "Last seen": "Last seen",
    "Latest Change": "Latest Change",
@@ -378,12 +383,14 @@
    "There are no folders to share with this device.": "There are no folders to share with this device.",
    "They are retried automatically and will be synced when the error is resolved.": "They are retried automatically and will be synced when the error is resolved.",
    "This Device": "This Device",
+   "This Month": "This Month",
    "This can easily give hackers access to read and change any files on your computer.": "This can easily give hackers access to read and change any files on your computer.",
    "This device cannot automatically discover other devices or announce its own address to be found by others.  Only devices with statically configured addresses can connect.": "This device cannot automatically discover other devices or announce its own address to be found by others.  Only devices with statically configured addresses can connect.",
    "This is a major version upgrade.": "This is a major version upgrade.",
    "This setting controls the free space required on the home (i.e., index database) disk.": "This setting controls the free space required on the home (i.e., index database) disk.",
    "Time": "Time",
    "Time the item was last modified": "Time the item was last modified",
+   "Today": "Today",
    "Trash Can File Versioning": "Trash Can File Versioning",
    "Type": "Type",
    "UNIX Permissions": "UNIX Permissions",
@@ -428,6 +435,7 @@
    "When adding a new device, keep in mind that this device must be added on the other side too.": "When adding a new device, keep in mind that this device must be added on the other side too.",
    "When adding a new folder, keep in mind that the Folder ID is used to tie folders together between devices. They are case sensitive and must match exactly between all devices.": "When adding a new folder, keep in mind that the Folder ID is used to tie folders together between devices. They are case sensitive and must match exactly between all devices.",
    "Yes": "Yes",
+   "Yesterday": "Yesterday",
    "You can also select one of these nearby devices:": "You can also select one of these nearby devices:",
    "You can change your choice at any time in the Settings dialog.": "You can change your choice at any time in the Settings dialog.",
    "You can read more about the two release channels at the link below.": "You can read more about the two release channels at the link below.",

gui/default/syncthing/core/syncthingController.js

@@ -2599,15 +2599,14 @@ angular.module('syncthing.core')
                             $scope.restoreVersions.filters['start'] = minDate;
                             $scope.restoreVersions.filters['end'] = maxDate;
 
-                            var ranges = {
+                            var ranges = {};
-                                'All time': [minDate, maxDate],
+                            ranges[$translate.instant("All Time")] = [minDate, maxDate];
-                                'Today': [moment(), moment()],
+                            ranges[$translate.instant("Today")] = [moment().startOf('day'), moment()];
-                                'Yesterday': [moment().subtract(1, 'days'), moment().subtract(1, 'days')],
+                            ranges[$translate.instant("Yesterday")] = [moment().subtract(1, 'days').startOf('day'), moment().startOf('day')];
-                                'Last 7 Days': [moment().subtract(6, 'days'), moment()],
+                            ranges[$translate.instant("Last 7 Days")] = [moment().subtract(6, 'days').startOf('day'), moment()];
-                                'Last 30 Days': [moment().subtract(29, 'days'), moment()],
+                            ranges[$translate.instant("Last 30 Days")] = [moment().subtract(29, 'days').startOf('day'), moment()];
-                                'This Month': [moment().startOf('month'), moment().endOf('month')],
+                            ranges[$translate.instant("This Month")] = [moment().startOf('month'), moment()];
-                                'Last Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')]
+                            ranges[$translate.instant("Last Month")] = [moment().subtract(1, 'month').startOf('month'), moment().startOf('month')];
-                            };
 
                             // Filter out invalid ranges.
                             $.each(ranges, function (key, range) {
@@ -2628,6 +2627,7 @@ angular.module('syncthing.core')
                                 maxDate: maxDate,
                                 ranges: ranges,
                                 locale: {
+                                    customRangeLabel: $translate.instant("Custom Range"),
                                     format: 'YYYY/MM/DD HH:mm:ss',
                                 }
                             }).on('apply.daterangepicker', function (ev, picker) {