[WebUI] Keep debug js in packaging and fix script lookup

Packaging:

- Decided that the debug files are useful for end-user so keep them in
  package installation. For debug script_type to be usable all debug
  file need to be avaialble so extjs debug files also included.

Script type selection:

- Fixed dev and debug request args to be properly decoded on Python 3,
  otherwise comparison would fail and allowed any case for values.

- Modified the choosing of the script type to pick debug if specified
  as previously always choosing dev type if dev version was True. A rare
  scenario but useful but now debug is used if specified otherwise use dev.

- Changed the order when looking for alternative script types to start
  with dev so that if debug is specified but missing it uses a similar
  script type as previously would fallback to normal which is likely
  undesired.

deluge/ui/web/server.py

@@ -564,15 +564,15 @@ class TopLevel(resource.Resource):
 
     def render(self, request):
         uri_true = ('true', 'yes', '1')
-        debug_arg = request.args.get('debug', [''])[-1] in uri_true
+        debug_arg = request.args.get('debug', [b''])[-1].decode().lower() in uri_true
-        dev_arg = request.args.get('dev', [''])[-1] in uri_true
+        dev_arg = request.args.get('dev', [b''])[-1].decode().lower() in uri_true
         dev_ver = 'dev' in common.get_version()
 
         script_type = 'normal'
         if debug_arg:
             script_type = 'debug'
-        # Override debug if dev arg or version.
+        elif dev_arg or dev_ver:
-        if dev_arg or dev_ver:
+            # Also use dev files if development version.
             script_type = 'dev'
 
         if not self.js.has_script_type_files(script_type):
@@ -581,9 +581,10 @@ class TopLevel(resource.Resource):
                     'Failed to enable WebUI "%s" mode, script files are missing!',
                     script_type,
                 )
-            # Fallback to checking other types in order and selecting first with files available.
+            # Fallback to checking other types in order and selecting first with
+            # files available. Ordered to start with dev files lookup.
             for alt_script_type in [
-                x for x in ['normal', 'debug', 'dev'] if x != script_type
+                x for x in ['dev', 'debug', 'normal'] if x != script_type
             ]:
                 if self.js.has_script_type_files(alt_script_type):
                     script_type = alt_script_type

setup.py

@@ -162,6 +162,8 @@ class CleanWebUI(cmd.Command):
 
     def run(self):
         js_basedir = os.path.join(os.path.dirname(__file__), BuildWebUI.JS_DIR)
+
+        # Remove files generated by minify script.
         for js_src_dir in BuildWebUI.JS_SRC_DIRS:
             for file_type in ('.js', '-debug.js'):
                 js_file = os.path.join(js_basedir, js_src_dir + file_type)
@@ -171,6 +173,14 @@ class CleanWebUI(cmd.Command):
                 except OSError:
                     pass
 
+        # Remove generated gettext.js
+        js_file = os.path.join(js_basedir, 'gettext.js')
+        print('Deleting {}'.format(js_file))
+        try:
+            os.remove(js_file)
+        except OSError:
+            pass
+
 
 class BuildTranslations(cmd.Command):
     description = 'Compile .po files into .mo files & create .desktop file'
@@ -532,9 +542,6 @@ _package_data['deluge.ui.web'] = [
 ]
 _package_data['deluge.ui.gtkui'] = ['glade/*.ui']
 
-if 'dev' not in _version:
-    _exclude_package_data['deluge.ui.web'] = ['*-debug.js', '*-debug.css']
-
 docs_require = ['sphinx', 'recommonmark', 'sphinx-rtd-theme']
 tests_require = [
     'coverage',