Fill tool docs & ensuring PO translations

And also grabbing txt versions of recent fr_FR updates.

src/po/zh_TW.po

@@ -9,7 +9,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: tuxpaint\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-02-20 17:52-0800\n"
+"POT-Creation-Date: 2021-02-20 20:40-0800\n"
 "PO-Revision-Date: 2014-06-24 14:46+0800\n"
 "Last-Translator: Song Huang <song@song.tw>\n"
 "Language-Team: Chinese (traditional) <zh-l10n@linux.org.tw>\n"
@@ -228,6 +228,39 @@ msgstr "<9>spare-9a"
 msgid "<9>spare-9b"
 msgstr "<9>spare-9b"
 
+#: ../fill_tools.h:49
+msgid "Solid"
+msgstr ""
+
+#  Line drawing tool
+#: ../fill_tools.h:50
+#, fuzzy
+#| msgid "Lines"
+msgid "Linear"
+msgstr "畫線"
+
+#: ../fill_tools.h:51
+msgid "Radial"
+msgstr ""
+
+#: ../fill_tools.h:55
+#, fuzzy
+#| msgid "Click in the picture to fill that area with color."
+msgid "Click to fill an area with a solid color."
+msgstr "在圖案中按下滑鼠來用顏色填滿整個區域。"
+
+#: ../fill_tools.h:56
+msgid ""
+"Click and drag to fill an area with a linear gradient (from the chosen color "
+"to transparent)."
+msgstr ""
+
+#: ../fill_tools.h:57
+msgid ""
+"Click to fill an area with a radial gradient (from the chosen color to "
+"transparent)."
+msgstr ""
+
 #  Congratulations #1
 #  Congratulations #1
 #. Congratulations #1