[GTK] Fixup translation strings

- Use named placeholders to allow translators to change text order.
- Refactor fpcnt to use format() and markup strings properly.

- Remove gettext.js creatation from generate_pot script since this step
  is now always done at build-time.

deluge/ui/gtkui/mainwindow.py

@@ -313,7 +313,9 @@ class MainWindow(component.Component):
                 status['payload_upload_rate'], precision=0, shortform=True
             )
             self.window.set_title(
-                _('D: %s U: %s - Deluge' % (download_rate, upload_rate))
+                _('D: {download_rate} U: {upload_rate} - Deluge').format(
+                    download_rate=download_rate, upload_rate=upload_rate
+                )
             )
 
         if self.config['show_rate_in_title']:

deluge/ui/gtkui/tab_data_funcs.py

@@ -22,12 +22,14 @@ def fratio(value):
 
 
 def fpcnt(value, state, message):
-    textstr = _(state)
+    state_i18n = _(state)
     if state not in ('Error', 'Seeding') and value < 100:
-        textstr = ('%s %.2f' % (textstr, value)).rstrip('0').rstrip('.') + '%'
+        percent = '{:.2f}'.format(value).rstrip('0').rstrip('.')
+        return _('{state} {percent}%').format(state=state_i18n, percent=percent)
     elif state == 'Error':
-        textstr = _('%s: %s') % (textstr, message)
-    return textstr
+        return _('{state}: {err_msg}').format(state=state_i18n, err_msg=message)
+    else:
+        return state_i18n
 
 
 def fspeed_max(value, max_value=-1):

generate_pot.py

@@ -18,7 +18,6 @@ import re
 from datetime import datetime
 from subprocess import call
 
-from gen_web_gettext import create_gettext_js
 from version import get_version
 
 # Paths to exclude
@@ -108,7 +107,4 @@ for filepath in to_translate:
     if filepath.endswith('.h'):
         os.remove(filepath)
 
-# Update web js gettext
-create_gettext_js(WEBUI_JS_DIR)
-
-print('Created %s and updated gettext.js' % POT_FILEPATH)
+print('Created %s' % POT_FILEPATH)